hektikTo answer your sniper question: Powah plays on 75hz
DavidTheWinShadowburn is one of the best DM soldiers and he plays with a 60hz monitor
alfaRR also plays on 60hz and he's a god at projectile classes,
Honestly, people have got to STOP saying that. saying that you can only be good on 120hz is just as dumb as saying 120hz is no better than 60hz because there's someone good who plays on 60hz
it might cross your mind that maybe these guys would be even better on 120hz. who knows. these things aren't correlated like you're making it out to be.
i think the general consensus is that if you're bad, it won't make you instantly good, because it won't aim for you(duh), but it helps with tracking and aim overall, so it definitely improves someone's dm, if he already knows how to play. if it improves a lot or a little will depend on the person...