I thought Metro 2033 Redux brought some changes to the difficulty. Some people complained that in the original, sneaking is really hard. In Redux, it seems surprisingly easy to stab everyone with a knife or something.

I think they made the AI somewhat more stealth friendly, basically.

The graphics changes seem to make the game more colourful.

Now that you mention it. Yes, they made the stealth work better but regarding the exploring out in the open possibility they did not change much since you are not supposed to stay long out in the open because of radioactivity and the earth being doomed and such ;)

The orginal doom 3 and resurrection of evil (roe) is all we really needed because with the original game modded it is the BFG version plus more, including the new flashling mechanic and better graphics. Having the bfg version is okay if people don't want bother taking an hour to download the mods and install them which takes a little effort but is well worth it as the modded original is mind blowingly good graphics.

Crysis is another game that once modded, wow it looks way better, its so awesome to have these original games with mods, they look way better with upgraded textures, Parallax occlusion mapping (POM) to make the textures pop out and look like they are 3d, better lighting, better weapons, better special effects etc.

Are you sure? And what about this? And then there still is the the multi language support absent from original DOOM games.

At only $3 I took a chance and while I can't run it at max res, I still got it looking pretty good.

I think I may have been to hasty in my earlier criticism and this too could revert too. :P

The flashlight isn't as big if a deal as I thought and it was actually nice to start finding all sorts of hidden stuff I had missed before. The lessening of jump scares is okay with me too because honestly I thought the original had too many monsters jumping in out of nowhere as is. I understand one of the soldiers doing this, but what does a fucking zombie know about laying in wait and jumping out at just the right time? :P

The increased light complaint throws me. I'm not seeing it. I have the original and the BFG both installed and, not counting being able to use the flashlight more, the overall atmospheric lighting doesn't seem any brighter or more forgiving. It seems just as dark as ever.

My only concern now is bigger areas. She is running great with four or five beasties in the room but I'm worried if I go up against 20 or so my FPS is going to drop like a rock. Keep my fingers crossed because I'm going to remove my disc version right now. My harddrive space is too precious to keep both copies installed and this one is easier to maintain, and remove, and reinstall.

Not merely similar, actually the exact same! Starting from v1.666, you could play Doom II with the Doom 1 executable, or Doom 1 with the Doom II executable -- they were the same file. The game just looks for the first IWAD it finds and then sets a few different behaviors depending on which one it is. On the top of my head, the conditional differences are:
- different list of animations and switches. This is required because the game errors out if it doesn't find all the required textures for the list it's loading.
- different level progression, including the associated level metadata (name, music, sky, par time, intermission, etc.)
- during map initialization, preventing spawning of the new Doom II monsters in Doom 1 mode (you can cheat around this with modding tools though, by changing their editor numbers)
- cannot switch to the super shotgun in Doom 1 mode
- cannot pick up the megasphere in Doom 1 mode
- different noclip cheat code (in Doom 1 it's idspispopd; in Doom II it's the much simpler idclip)

Everything else behave identically. That's also why every single source port that can play Doom can play both Doom and Doom II without problem (and some do away with the restriction on Doom II content, as long as you provide the required resources).

Metro 2033 Redux is pretty much a remake in the version of the engine used in Metro Last Light. I haven't played the original version, but I've seen plenty of videos on YouTube -- the most obvious difference is in the UI, including the player character model (e.g. his watch, etc.); there are also differences in some character models, textures, and so on.

One frustrating aspect of the GOG release of the Redux Metro games, though, is that the Linux versions aren't included. This most likely isn't their fault; it's probably Valve who must be doing something to keep those ports exclusive to Steam -- but still, it's frustrating.

The BFG edition was mainly a port to the consoles with the PC version being just a side product and a cash in for new IP owner Bethesda. I consider it technical inferior to the original, especially in terms of sound. They cut the EAX support completely which I consider a major flaw as the sound in original Doom 3 was (and still is) absolutely amazing.

That's easy for you to say. I know English but there are simply several people out there who are too old or just not able to learn it (yes people who are having a hard time learning or understanding different languages still do exist). You being norwegian have grown up afaik speaking at least Norwegian and English. However there are countrys in which you basically only hear your native language if you are not in school. Germany is an example for this. As you might know nearly everything is dubbed here so it's no wonder that especially older people don't have much experience with other languages. Anyway: I never meant that the point of BFG being multi language was essential but I would not be surprised if this also was considered by GOG when they decided to sell it here.

Sure, it might be easy for me to state this as we (at least in the Scandinavia) learn English from 1-3 grade, but I was really directing my frustration against some "old and slow" (yes, every country has too many of them) gray-eyed politicians out here which still refuses to remove a politic that is borderline protectionism.

France, Germany and Russia are among those that I would count as few of the worst. Countries like Hungary f.ex. I can understand as many lacks proper education. Most don't even understand more than "hello" and "thanks". Was there this summer and I had to point or draw what I asked for in stores and other places. Asking for direction is like.... well, you get the picture.

And honestly, I really understand that Germans are a proud people - but to speak English in Germany is almost like spewing out profanities. Not that I know much about the education system in Poland, but even they seem to be quite proficient in English and wouldn't look at you as if you were a troll just for using English to communicate. :-D

Haha, that was a very good one!

Don't forget the difference between cities and rural areas, also the fact that there is no homogeneous Germany like some may believe but it's still a mixed bag of several cultures.
In my town English is spoken more than German since it's a melting pot, btw.

Well, big events in the past tend to shape us ;-)

You're right, there are vast differences depending on where you are in a country.

Are there any mods to replace what was lost and changed from the original in the BFG version? Do original doom 3 mods work with the BFG version on gog?

I haven't seen such a thing, and I don't suppose there'd be much reason to complain about the non-release of the original version, if such a mod existed. No.