For me Motorhead are very much like AC/DC regards drummers. Phil Rudd added a kind of groove to the bands sound, that was lacking during Simon Wright and Chris Slade's tenures. Phil had an almost 'soft' way of playing the drums, especially apparent on the first few albums, which I liken to him sort of feathering the drums (if that makes sense). I know he was often beating the crap out of his kit, but it just had that smooth kind of groove. Mikkey is an excellent drummer and is a real tub thumper, in the nicest possible way. He does tend to smash the drums more to my ears, which probably works better in some of the faster songs, but as Motorola says certain songs don't sound the same when he plays them. That shouldn't be an excuse not to play them though.
You couldn't buy me with a million babe