in europe you can drink ...I think .... there were drunk ppl at shows everywhere I went in europe and the usa

I think that more than european being a great 'crowd' it is more about the usa being a very passive one most of the time...the japanese crowd is very into the music but is not showing much for example every audience is different
from an artist point of view the european crowd is first good to watch at because packed (it is important actually to not be too comfortable to ENTER a show emotionally) then you also have the attitude .. I think often the european audience goes to a concert to listen to the music they love more often the usa audience goes to a show to have fun with friends drink talk laugh eat etc (this is a general vision not talking about die hard fans here)