but it doesn't seem to make sense to say on the one hand:-
"The latest consumer survey from Which? states that there has never been a better time to find a good broadband deal, so long as you avoid "the big three" providers (BT, AOL and NTL)."
and then, later on:-
"One other thing to note is that BT and AOL are by no means terrible ISP’s"
Make your minds up, Which.
I've been with BT since broadband started, and have never had cause to complain. The point is, unless you have used another ISP you aren't likely to know whether yours is better than any of the others, are you? That's why surveys like this are interesting, but that's all - they aren't a definitive guide.