Only fps I've played lately has been RO2 and I do ok in that. Not exactly twitchy competitive fps, maybe. But even warband is kind of an fps. I think being comfortable with the mouse, regardless of how many objective technical advantages it may or may not have, is more important than anything. Then there's inherent/learned player skill. If you are naturally terrible or just new, there's no number of technical boosts that will surmount that lack.