There are a number of games I can never get any good at whatsoever. For the most part though, most other people seem to have a hard time with those games as well.
A few I am utterly awful at:
MISSILE COMMAND
This game gets off on my anguish and despair..
GRAVITAR
I just don't get this game at all. Fighting gravity and having to deal with enemies firing at you at the same time is just batsh*t insane!
TARG
Crazy.. the enemies just get too damn fast. Way the hell faster than you!
I can get awful at many games since I frustrate easily. With a clear head I"m decent at most games.