Kane and Lynch 2.

I enjoyed the first game quite a bit, in spite of all the bad mouthing it got. The second game, however, was definitely not my cup of tea.

Riiight. I actually liked both. Single player for part two was way to short. But I loved the bleak, over the top, atmosphere of the games.

Assassin's Creed, Castlevania 2, Keepsake, Metal Gear Solid 1-4, Monkey Island 2, Post Mortem, Shadow of the Colossus, Silent Hill 4 and 5.

Those are some really atrocious games that I remember finishing. They were either highly frustrating, too boring, overrated, or simply terrible. Now that I think of it, it would have been if I had never played them in the first place.

Pro Wrestling on the old NES. I think it didn't even play a song, it just flashed "Congratulations!" and went back to the title screen.

Ooh - someone should do a 'most dissapointing ending' thread at some point, if it hasn't been done already/...

You clearly don't remember Strider on the Megadrive. "You have completed the training, now the real mission begins", completing the game a second time gives you the message "You have completed the training, now the real mission begins" and that repeats ad infinitum.

Hawkeye on the C64 gave some excuse about a time machine and an electric lemon to make you go through it all again!

Xenon 2 would be a damn strong contestant there.

Good point. Pro Wrestling wasn't bad for its time, but the ending sucked. Worst game I ever finished.... Hmm... FEAR 2. Compared to the first one it was atrocious.

I think mine would have to be Cyberia.

I was probably around 13 or 14 back when I got it bundled with a computer. Nice graphics for its time, but that's about it. I'm not sure about the plot line because I didn't understand all the details with my limited English at the time, but I'd hazard a guess it wasn't pure genius.

Looking back, most of the gameplay consisted of going through a mostly linear set of prerendered rooms in predefined paths between predefined points (hey, it looks like a movie!) where you just selected the next direction to go into using somewhat cumbersome controls. Sort of like point-and-click but without the pointing and clicking.

The strolling around was occasionally interrupted by combat with predefined enemies using somewhat sluggish controls and frustratingly exact timing to peek out of cover and try to hit the enemy in a predefined way. In addition, there were some kinds of flight sections with predefined enemies that could only be hit within a predefined (sometimes rather short) window and which you pretty much had to know were coming if you wanted to hit them.

The sudden deaths and somewhat sluggish controls meant that I had to repeat a lot of that several times. (That might also have something to do with my skills, but I'm sure that doesn't account for all of it.) I guess there was something into it since I actually ended up finishing the game, or at least I think I did, but I couldn't see myself doing that now that I actually give my time some value.

I haven't really finished a whole lot of bad games, but if I get around to finishing UFO: Aftershock some day, I might unfortunately have to add it to the list. It's not really that bad in its entirety, and it's got parts that have been done really well, but it's just so repetitive that it gets rather boring long before the end.

Have played too many games over the years so I can't list them all. :P But here's some I
like:

Alone in the Dark 1-3, Beneath A Still Sky, Broken Sword series, Castlevania Symphony of the Night, Command & Conquer all games, Divine Divinity, Dune 1-2, Final Fantasy 6-7-8-10-Crisis Core, Hexen games, God of War series, Legacy of Kain series, Prince of Persia all games from classic to modern, Resident Evil 1-5, Silent Hill 2-3-Shattered Memories, Syberia games, The Legend of Zelda A Link to the Past-Ocarina of Time-Twilight Princess, The Longest Journey, Tomb Raider all games...

All right, I've already listed too many games I love, can't list them all really, would be too long. Anyway, I hope you got some idea of what I like. :)

You like Syberia but not Monkey Island......I'll back away slowly.

You're from Bulgaria, maybe something in MI is lost to a non-native English speaker? But no rule everyone has to like everything.

Another bad game I finished is Darkseed 2. Terrible writing, worse puzzles, badly handled voice acting, and laughably bad game engine. There's a spot where the noise of a bio-mechanical moving hook track is provided by a guy humming "eeeeeeeeee." Only reason anyone played it was for the art. Or in my case, unknown reasons.
I remember the demo, wasn't impressed.

I'll see Cyberia and raise Angel Devoid. But that one was actually fun in many ways. Good bad.

Edit: You said LOWEST critically acclaimed game so disregard my rant on Halo...

Probably the obscure H.U.R.L. for the PC.

Halo 1 and 2 both had significant backlash behind their huge success. A large number of people had the same complaints.