Linkin Park - used to love them when Hybrid Theory came out but their latest stuff is boring.
Hot Chip - They've gradually been getting worse since "The Warning"
The Killers - Hot Fuss was great Sam's Town was decent but Day And Age has not one memorable song apart from Spaceman
The Streets - His first album was fantastic imo, the soundtrack to urban culture. second album was great aswell but his music just has nothing much to say now.
Dizzee Rascal - His first album was groundbreaking and intellectual, but now he's dumbed down his music for the t4 on the beach generation. Its a shame because I'd imagine that most people who hate him and think he has no talent are the same people who haven't heard his first album and only associate him with songs like Dance With Me, Bonkers, Holiday etc.
Kings Of Leon - still like them but their brand of rock has kind of blended too much in with everything else out. I'd like them to revisit that identity that they had with their first few albums that set them apart.
Noisettes - never really "loved" them but saw them live a few years ago and thought they were really good so bought their album and thought that was really good.. then their second album comes out with that really annoying "Don't Upset The Rythm" song. they basically sound like everything else out there now and its annoying that people think that they're a new band when they've actually been around for a good few years.
Eminem - Same as The Streets really, used to be fantastic, in your face, great lyrics great beats but now his music just sounds like rehashed versions of his older stuff but lacking any bite or hooks.