Atmosphere at most English club games is pretty crap. There is a few exceptions though like Stoke and WBA (esp against the big teams), but generally since the advent of modern all seater areans the atmosphere has generally been crapper apparently. Arsenal's fans are prob the worst of the lot though, I know in the old days they used to call it the "Highbury Library". Heh.
Atmosphere def much better at Italian games, fans much more loud and rowdier but unfortunately that usually tends to turn into violence, racism and other examples of stupidity