I'd certainly agree with you about the Darkness, I think they're appaulling and embarassing. It's all been seen and done before.
I guess it's all down to personal taste as I think the Streets are fresh and original. I adored Oasis, but now find mimic acts boring.
Busted are good at what they do, they don't claim to be the next Oasis, Beatles, or anything else. They play to teens and can't proclaim to be anything, thus I don't think they are overrated. if they appeared in Q or NME as the next Rolling Stones I'd be worried.