re: Alien Ant Farm, Hoobastank, Puddle of Mudd

I disagree, see Slash and Myles Kennedy.
Audioslave was great in their heyday.
Chevelle has made some great music.
Cage the Elephant, The Black Keys, and The Racounteurs have all been a breath of fresh air.
Jack White, both solo and in the White Stripes, has been outstanding.

There's still good rock music being made, it's just much much harder to find these days.