my experience playing XBL with ppl from US is kinda good. depends on the connection. on good days (70% of the time), there seems to be no lag on XBL. the other 30% of the time i can't even connect properly to XBL. keeps disconnecting.

previous experience with WoW too is quite good for me. i'm on US server and always in the chaotic bg but there's no lag whatsoever. quite low latency too (still "green" in color for a place thousand miles away from US).

and oh, i'm on 1mb plan.

i think it depends on places when it comes to screamyx. some places i know got fast connection (damansara, bangsar), but some places just sucked big time.