What difficulty do you play games on?

for action and fps games i usually play on hard, but on guitar hero or rock band it would be expert.

Depends on the type of game.

Strategy/RPG, usually start at Hard, Old Skool; or something among these lines. Then I try to get it as hard as I can. Once I complete the hardest setting I think I can, I will redrop it to a level which is fun (civilisation for example, always thinking to be ultimately efficient is fun for a game or two, but a big part of the fun is to actually do what you WANT...so this is where I usually drop the difficulty a tadbit)

Arcade: Usually around medium, but if I really like a game, I will eventually tune it up, possibly all the way to completing it at the hardest setting.

Action/FPS/reflexs/coordination: Easy, Sissy or ultra easy. I seldom complete any of these games.