I always had the feeling that he was a nice but quiet person, and I liked him...but, as far as his talent as a drummer, I think it was a bit weak. I'd like to hear from bdp24 and others who are drummers, or like me, just wannabees who closely watch drummers in bands.
As an example of what I consider to be his substandard technique, I would suggest listening to Sway from Sticky Fingers. He literally stumbles through a couple of the fills, especially right before Mick Taylor's brilliant solo which closes the song. One of my favorite Stones songs.
Well, that's what I've always thought about his playing, but he's been a part of my life for many years, and I'll miss him.