I agree, Bill was a great drummer. Listen to
Hand of Doom, he does some smooth jazzy drumming, followed by such a smooth bass line from geezer. It's pretty jazzy, and then they crank up the tempo, such a great song.
06 Hand of Doom- Black Sabbath - YouTube
Bonham was great, but I think someone like Mitch Mitchell is every bit as good, probably better, and he doesn't get near as much praise as Bonham.
I think Iommi has some great solos. He doesn't even really do any riffing in this one, just some great (although faint) soloing. How can a song be this cool and trippy? This song also shows off some sweet percussion from Bill.
Planet Caravan - Black Sabbath - YouTube