I started playing Doom on my computer tonight after talking about it with some friends, and damn it's still hella fun. I actually think Doom is more fun than most of today's FPS's.
I attribute it to two things:
1) Simple, action packed gameplay. No puzzles, no enemy AI, no tactical battles, no story, no cutscenes, just killing, killing, and more killing. Hell, you don't even have to look up or down. Walking into a room and killing 50 imps with a shotgun is a feeling that is unrivaled in gaming to this day.
2) Absolutely incredible level design. They're just simply incredible.
Anyone else think this game has aged extremely well?
