personally I found the original Super smash bros. the most fun out of all the games I've played at a friends house. But as far as single player goes, I'm gonna have to say that it's a tie between Metal Gear Solid 4 and Dead Space.

I can't pick one. Was thoroughly addicted to Puzzle Bobble and FF8 tho :D

I had a hardcore addiction to "The Adventures of Lolo" on the NES

Kingdom Hearts ! That's game I spend the most hours playing.
xD Me and My friend actually cried when we finished it xD

MMORPG
Ultima Online
EverQuest
World of Warcraft

FPS
COD4 Modern Warfare
America's Army

RPG
Final Fantasy 3
Final Fantasy 7
Lufia
Chrono Trigger
Suikoden

Best overall game EVER
Resident Evil (the first one)

Final Fantasy 1 - 12
Resident Evil 3 & 5
World of Warcraft

:D

I defenetly have to defend this titles here.

RTS
-Starcraft
MMORPG
-Ragnarok online
Action
-Counter-Strike
RPG
-Final Fantasy 10
Driving
-NFS Underground (the first one)

Then again i'm more like older titles in games :x
only game i'm waiting and ever did is Starcraft2 (i don't really know how my college willkeep up when it comes out :|)

My two favorites would be...

Final Fantasy VIII
Xenogears

On a side note, i've never seen so many people that liked FFVIII in one place...

I have to say my all time favorite games have been:
Final Fantasy X
Kingdom Hearts
Metal Gear Solid 2-3
Oblivion
Fallout 3
Haunting Ground
Fatal Frame 3
Jet Set Radio Future
Half-Life 2
Left4Dead
<3