To counter the "What went Wrong" thread I felt the need to start a thread about what musicians, do you feel have actually gotten better.
I would have to say the Gorillaz. Their first album (I'm not counting the remix albums) was an album I both loved and hated. It was very experimental but I found that I only liked half the album and I loathed the other half. Then Demon Days got released and I checked it out. I ended up loving almost every song. The album is still somewhat experimental and yet a little more cohesive. It's a little less "angry" but it's still got that sarcastic wit about modern pop culture. It's matured in a good way.