yeah, I know this has probably been done many times before, but I only joined last week and I'm interested to see what other people think. In my opinion the following are all ridiculously overrated:

Nirvana
U2
Oasis
Rolling Stones
Muse
Ash
Manic Street Preachers
Charlatans
Keane (obviously)

and probably lots more. anyone care to agree/disagree?