Horror: WaxWorks, Alone in the Dark
RPG: Dark Sun, Blade of Destiny, Ultima Underworld, Eye of the Beholder, Lands of Lore, Stonekeep, Diablo, Baldur's Gate, Icewind Dale
Sci-fi: System Shock, Terra Nova, Mechwarrior: Mercenaries, Wing Commander, Tie Fighter
Strategy: Dune 2, Master of Orion, Command & Conquer, Total Annihilation
Adventure: King's Quest, Space Quest, Maniac Mansion, Monkey Island, Blade Runner
FPS: Wolfenstein, Doom, Quake, Future Shock/Skynet
PC Games 2000-2006
Horror/Adventure: The Thing
RPG: Neverwinter Nights, Arx Fatalis, Morrowind, Oblivion
Sci-fi/FPS: Alien vs Predator 2, Mechwarrior 4: Mercenaries, Doom 3, Quake 4, Farcry, Battlefield games
Strategy: Ground Control 2
I don't remember any others right now, but all of these are classics.
WARCRAFTII (This may be the best game of all rts)
Darkseed (remember when game writers had imagination)
When Worlds Collide( this game was voice controlled)
Wing Commander 2
Worst game(s) of all time
GTA ( all of them)
Silent Hill (boring)
I would say Unreal Tournament 2004 entertained me the best on the PC (with HL2 a close second, followed by Warcraft III: TFT, Starcraft, and Diablo II: LoD). Chrono Trigger owned the SNES, while Tales of Symphonia was my favorite GameCube game.
I'll give you one from every console (or at least the decent ones):
NES: Volleyball (yes....just volleyball...that's the title.....addictive)
SNES: Super Mario RPG (loved that game with a passion)
Genesis: Eternal Champions (this old-school fighting game w/ "fatalities"...i loved it)
Saturn (yes, I had a Saturn): Panzer Dragoon (classic classic classic)
3DO (yes, pops made a BIG mistake being me and my brother this one): Super Street Fighter blah blah blah (Akuma's first apperance, got owned by him every time)
Dreamcast: Marvel Vs. Capcom 2 (the best 'port of the best fighting game I've played recently)
Gamecube: Tales Of Symphonia (extremely underrated, addictive, and a breath of fresh air into the RPG scene, BUY IT!!!)
PS1: Parappa the rapper (when you find yourself singing Master Chop Chop Onion's song during class, you know you're hooked)
PS2: Guitar Hero (i know it's recent, but me and my buddies can't stop playing this game....it's like crack, except non-edible)
XBox: Halo ('nuff said)
XBox 360: Oblivion (addictive, immersive, crazy)
PC: Oregon Trail (just kidding)----> WoW (i see why there's a debate about video game addiction)
On computers I go all the way back to an Apple II+ (dating myself a bit, eh?) to the ORIGINAL Wolfenstein game. More fun than a barrel of schweinhunds...
I loved the Bonk series on the TurboGrafx system - cool headbutt attacks, and he could climb walls by chewing his way up them - kooky but loads of fun. Early Sonic games on the Sega too - way cool.
More recent PC games - Starcraft, Diablo I and II, and WoW have been my biggest time sinks, with Call of Duty, Max Payne, NOLF, and Far Cry as favorite shooters. I also loved a strange Mac game called Dark Castle from the late 80's - massive platforming goodness with great sound.