Spelunker
This propably was the first computer game I ever played. I was 4 back then and the C64 came with Spelunker, Stealth, Raid on Bungeling Bay and some other game that didn't work, and I believe Spelunker was the first game we tried. Not that special game, though it has great music.
System Shock
This is simply the best game I have played. (And
some people at GameSpy seem to agree with me
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) In fact I have just started playing it again, since someone made a "patch" that allows using 1024x768 resolution with it. And it doesn't even look that bad despite the fact that its as old as Doom 2, it has 3D objects, real time lighting, leaning, jumping, great storyline, great voice acting... even 'bullet time'
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A game thats only fault was that it was 5 years ahead of its time.
Doom
I got to try Doom once when I still had an Amiga, and after that I just had to get a PC no matter what. Doom had great atmosphere and great gameplay, and very impressive "3D" graphics. I still play it sometimes using the various source ports like Doom Legacy and jDoom that add things like 3D acceleration.
Operation Flashpoint
OFP changed my view on 3D shooters. After it everything else just seems so boring and restricted, if I hadn't ever played OFP I propably would have thought games like HL2, BF2, etc. are great but now I find them as interesting as NFSU would be after playing LFS. I guess I also have had influence on OFP as I have made quite alot of mods for it...