Whether it is "worth it" will entirely depend on what exclusives you want to play on the Wii that you can't get on the PC. If you like things like Zelda or Monster Hunter the Wii is the system for you because there's little or nothing like that on the PC.
Similarly, the Wii has a strong line-up of classic console games via the Virtual Console, few of which are available elsewhere (with the partial exception of GameTap, but console games there are only available through an ongoing subscription and can't be purchased). Almost all well-known 8/16-bit games are available on the Virtual Console. This is of reduced value if you are already using PC emulation, of course.
In terms of native games the Wii is a poor choice for all non-exclusives; because of the vast technological gap between it and current-gen systems it typically gets heavily watered-down versions (and I'm talking in terms of actual content being absent, not just the inherently inferior graphics). Even if a particular game isn't available on the PC at all the Wii version might not be any good.
Also note that while all native Wii games work with the Wiimote and nunchuck some really need the Classic Controller or Classic Controller Pro to get the full experience (such as extra quick keys and moves and whatnot). You can also use a GameCube controller for some titles, but not all support it. A controller is also required for some VC and WiiWare titles. The Classic Controller or Classic Controller Pro is sometimes available bundled with games for a greatly reduced price (such as the current Monster Hunter Tri deal), but it's certainly something else to factor in. The "Motion Plus" add-on for the Wiimote, used to give more accurate movements in compatible games, is also an extra purchase (I'm not sure if any games actually require it though).
EDIT: also note that multiplayer on the Wii totally sucks. You need to exchange "friend codes" (arbitrary strings of numbers) in order to play a game together. You need a code for each game, and they are generated by the combination of that particular copy of the game and that particular Wii, so if your game or Wii breaks or something and you replace it you will have to use a new code.
A handful of games implement their own online service to get around these limitations (such as Monster Hunter Tri) but for the most part you will be using it for everything. Sites such as OneClick Wi-Fi and FriendCodes exist to help DS/Wii gamers meet up more easily and exchange friend codes.

I can't see the reaon for hyping CoD4, plants vs zombies or starcraft, hardly seems a valid reason for avoiding an entire platform, especially one that has games as good as Civilization, IL2 Sturmovik and Planescape Torment.

Firstly, there are region locked 360 games? Never seen one in all my time playing. Secondly, they violated the terms of service they agreed to, stiff shit for them.

Well, there are japanese ones, but otherwise; no.
The best thing about the 360 is the Live Arcade Marketplace. Lots of gems there for pocket money prices. 7/10 AAA releases suck, or are better on the PC anyway.
But Castlevania:SOTN on a big-screen with your ass promptly placed in the sofa? For like 6 bucks? Oh yes.

I agree that Halo is the Twilight of games.
That, and Harvest Moon....Must play.....again...

There are a few Wii games worth playing, more than most everyone is letting on.
Super Mario Galaxy 1 & 2
Twilight Princess
Mario Kart Wii is good
Super Smash Bros. Brawl is good
Trauma Center games are good
The Metroid Prime Trilogy is pretty much the best deal for your money that you are going to get this generation
The Japanese version of Super Mario Bros. 2 is on the virtual console
Phoenix Wright is on the virtual console
An awesome Star-Fox like N64 game (except on foot) called Sin & Punishment that was only released in Japan is on the virtual console
Monster Hunter Tri
Okami
No More Heroes 1 & 2
Wario Ware is kinda fun, but don't spend too much on it
Super Paper Mario is fun for a little bit, but don't spend too much on it
If Animal Crossing is your thing, you've got that
There is a new Sin & Punishment on the way, as well as a new 2D/3D Metroid that looks awesome.
Pikmin with Wii controls = probably awesome, but I haven't tried it.
Zack & Wiki is pretty damn good
Ghost Squad & House of the Dead 2 & 3 are great light gun games
That's more games than a lot of people buy any given generation.
By the way,
Play Uncharted 1 & 2 (it's worth getting through 1 to play 2)
As you mentioned, Killer 7 and REmake (especialy REmake) are awesome. Skies of Arcadia and the Sonic Adventure games, Paper Mario TTYD, F-Zero GX (GREAT, GREAT GAME), the Star Wars Roge Squadron games (these might be seeing Wii releases, I don't know) are all fun GCN games, and there are plenty. The Wii is a great Gamecube.
I wouldn't have recommended it a year ago, but now I think it's a solid purchase.

I have all the modern consoles.
My favourite are the PS3 and the DSi.
Regarding the original question about the Wii.
I got tired of the console in the first week or so.
I then used it less and less often. After about 6 months of using it about once per 15 days, I haven't switched it on for almost 2 years now.
Worst purchase ever for a console for me.

The Wii is the only home console I own and I like it. To me the virtual console is reason enough to own one. The other things I like: A focus on local multiplayer I have had more fun with Mario Kart Wii local multiplayer than any game since Quake. All the Mario games are qwesome. And Wii Fit is great (I've lost about 40 lbs while using it)! Anyone who wants to dis Wii Fit can go to hell.
I personally don't understand the appeal of the 360. You cannot play a shooter without a mouse, it simply cannot be done. The people on Live are psychotic. Worst of all you are giving more money to Microsoft which is simply unacceptable.
Anyway, if you like retro console games or local multiplayer buy a Wii. If not don't.

I think this needs to be here:
http://www.youtube.com/watch?v=x7PhJp3ciRQ

Hell no. The Wii is the worst console I have ever owned. I have only bought one Wii game (Super Mario Galaxy in 2007) and I am thinking of buying No More Heroes 2 and Sin and Punishment 2. Apart from the rather cool Virtual Console there is really nothing notable about the Wii at all. If you are wanting to get a console, I'd agree with what the others have said, the Wii is really your '2nd' console to go with your 360 and PS3. You'd get a better selection of games if you bought a PSP.

I got laughs out of this post. Yeah the Live crowd is totally psychotic and nuts, I likely wouldn't have any real friends on live unless I met them on PC first. As for wiifit, man try losing weight old fashioned way, I lost 80 pounds hitting treadmill and not eating. Boring. WiiFit might be fun but I wasn't impressed with it on my cousins Wii he had. He's also in the crowd of people who stopped touching it after a month of play.

Yeah I was thinking of buying a cheap 360 purely for Live Arcade (already own a Wii and PS3).

Oh you know I was just using an internet meme(see pic)
But seriously, they aren't games, just movies. MGS4, Heavy Rain, FF XIII, need I to go on?
Even the number of good games it is offering are just based on GRAPHIXX:
http://vsrecommendedgames.wikia.com/wiki/Playstation_3
Luckily I already have the PS3 thanks to my graphic whore dad, so I can play GoW 3 any time once it drops down the bar, like Dante's Inferno.

Dude... I have "the Last Guy" freaking epically fun game and pixel junk games (which are fun to)... all of which have shit for graphics :)
:) I have a all the systems... my ps3 is used most (mostly for watching movies... maybe an hour of gaming)... then the wii (when mil chicks come over lol nothing like mario cart/Brawl)
My 360 has been collecting dust heh

Let me just be clear here. I'm not saying you use Wii Fit for your primary exercises. Weights and a proper diet should make up 90% of a weight loss regime. However, having a graph charting your weight loss with no extra effort really helps. I'll admit it's all a gimmick but it's an effective one.