I'll try to stay away from givens like Creed or Nickleback. I'll also bold bands that I think are overrated, because I actually like some of them.

• Decemberists
• Death Cab For Cutie
• Bright Eyes
• A Loss For Words
  • Most pop punk bands are terrible.
• NeverShoutNever!
• A Day To Remember
• Iron & Wine
• The Flaming Lips
  • I just cannot with this band.
• Mac Miller
• Florence and the Machine
• We Came As Romans
• Asking Alexandria
• MGMT
• Kings of Leon
• Regina Spektor
• Elvis Costello
• The Who
• Aerosmith
• Built To Spill
• Coldplay
• Sex Pistols
• Neil Young
• Bikini Kill
• The Hives
• Arab Strap
• Spoon
• Ladytron
• Social Distortion

Basically, I hate acoustic guitars, anything included in the Pitchfork Indie Starter Kit, anyone who tries too hard to be ~quirky, and overall shitty musicianship.