I am enjoying today's mainstream rock a lot more than that of the early 00s. I generally like the Volbeat songs I've heard on the radio, and I've been meaning to check out their latest album. The Pretty Reckless have a pretty decent album from 2014. Even a couple bands I didn't care for in the 00s have songs out now that I enjoy (Shinedown and Disturbed). Heard a song by Avenged Sevenfold's new album on the radio today, that was pretty cool. Metallica's new album and singles from said album are miles better than anything from St. Anger. Earlier this year, Kaleo had a real cool song on the radio, but unfortunately, it's not at all representative of their sound, so eh.
Early 00s mainstream rock was among the all time worst mainstream rock, imo.