The best:
-Any game whose description can be summed up as, "Sword-wielding bad-ass/martial artist fights/slashes/shoots/kills his/her way through an evil army alongside (insert unnecessary sidekick here)." So in short, action games I guess.
-Fighting games (mostly 2D, but I have love for some 3D games such as SoulCalibur and Power Stone)
-RPGs (western, eastern, as long as it's compelling storytelling and fun to play)
The worst:
-Sports games. Especially sports games from the last decade. I know, managing salaries and gazing at statistics is exciting, but clearly it's not for me.
-FPS. Nothing against them, I just had bad experiences growing up with them. Any of my friends who liked FPSes always whined at me to play and then spent the evening gloating and guffawing as their superior memorization of all the maps and weapon spawn points made me a walking free kill. Yeah, bad sportsmanship was abundant.
-Real Time Strategy (except Dawn of War and its sequels). I believe others have eloquently summed up the problem with either loving them or feeling left out of the club. My aptitudes are reflexes and thinking on my feet. Resource management makes me
side note: SS, I will play Blazblue with you. I promise, I am not that great and I am always looking for somebody who actually wants to play.

However, there are 8 hours between us. How late do you usually stay up? ^_^;