Chilli peppers are fucking solid, the singer sucks, but there the most solid fucking band of the 90's by a long shot.
Queens of the stone age, aren't really overrated, there a niche band you either love there repetitive(self proclaimed robot rock) or you fucking hate it.
ACDC suck dick though, no talent other than dressing up in little boys clothing, all gimmick, shitty songs, repetitive fucking song writing, no fucking redeemable qualities, pure fucking shit.
Beatles are fucking solid you may not like them but you gotta respect that they can write some pretty fucking amazing songs. Anyone that has ever studied song writing/music theory will tell you there the bench mark for quality writing.
Nickleback are tricky they weren't so bad when people started ragging on them, however after they got famous they got real fucking bad quick they played into their own stereotypes or some shit.
The most underrated by far is Dire Straights. Sold like 60 million records, solid song writing got talent, and their easy to get. Yet most people don't even know who the fuck they are.