Doom and Quake were the only really great games id ever made, and even then they seemed better years ago when I didn't care as much about actual story or depth. AND even then D & Q were mainly a big deal because they pushed first-person computer gaming so far beyond where it had been before. With Quake 2 and Quake 3 they at least added some more color back into their games but they seem to have given up on that.
Doom is still their most fun game for me, it's not really focused on 'realism' (whatever that means in a fictional computer game world anyway), so you run around at 60 mph, carry 7 weapons at once, fight 300 things at a time, the levels don't really make any 'sense', etc. etc. etc.
Quake was true 3D but too brown and NIN-y, Quake 2 was okay but the levels generally somehow felt tiny, Quake 3 was fun for a little while, Doom 3 was plastic-y and dark and tried too hard to be scary, Rage, I dunno, I doubt I'll ever try it, I've already played Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, Left 4 Dead, Left 4 Dead 2, other post-apocalyptic zombie/mutant games that I can't remember