I tried out Brutal Doom because of this thread. I think it's been unfairly misrepresented by some people here. Yes it has the superficial facade of a gory joke wad but what's impressive to me is how much work and care has gone into rebalancing the game according to the creatively reworked gameplay.
I've actually been playing (Brutal) Doom 2 through with my 360 pad instead of a mouse, and something about playing it this way evokes the feeling I had as a 14 year old playing through Doom for the first time on our new 486. Because then I wasn't flying around with mouse controls at 100mph treating everything has shotgun fodder. Enemies still posed a threat then as I crept forward nudging left and right with the keyboard to dodge fireballs and marvelling at the overboard gore on display.
Gameplay-wise of course it's not classic Doom, but I like the fact that everything seems to be done in a way that's faithful to the spirit of the original and 90s FPSs is general. I didn't realise I'd missed gibbing enemies quite so much :) I'm glad id saw this - I'm honestly having more fun with this than I've had with an FPS in a long time. It pulled me away from Halo 4 and Far Cry 3 is feeling rather abandoned right now.
I know there those on here for whom the idea of a y axis alone is sacrilege, let alone the other developments Brutal incorporates, but in all honesty I think that in gameplay/gunplay terms, viewed as a modern FPS, Brutal Doom gives many commercial titles a run for their money.