Big fan of his work. IMO Ministry records have definitely suffered since his departure.
And Vegas is right- he's a pretty cool dude as well. My story-
Many years ago my roommate was FOH engineer for Ministry. Paul stopped by with him a few times and once while visiting he had to do a phone interview for Spin magazine. The only working phone in our apartment was this Crest-Man character plastic novelty telephone, (our GF's both worked for a dentist), but he kept his cool and did the interview with it.
I'll never forget the look on his face when he realized he had to use that stupid phone to conduct some official rock business. Priceless.