I've noticed no difference in skill level, really, its a personal thing, not a nationality thing. I've seen just as many crap Japanese players as good ones, same as western ones.
I've heard this complaint from Japanese players about smash, being sick of western. It seems to actually hold up though, as everytime I play a Japanese player (almost all of the time since my systems are Japanese) in Smash, if I win they disconnect right away.







