It varies a lot on a game to game basis. If the controls are bad, the game needs other redeeming features, and lots of them! Some times I'm just having trouble getting into a game, but I'll give more chances to grip me if it's gotten critical acclaim or forum hype.
I've played three session of Metroid Prime now, each for about an hour I think, and the game just isn't catching on. I know it's not a bad game, but it just fails to get me hooked. I guess I'll be giving it a few more chances down the line.







