I'd only saw Stamford Bridge is pretty poor when we're playing the smaller teams such as Wigan. It used to be fairly poor against team's like Bolton, Stoke and such; but for the bigger games it's pretty good-especially United, Spurs, Arsenal, Everton.
I was at the Rubin Kazan game last week and it was crap though-I mean the away supporters didn't help-there were 47 of them there.