I didn't see him on Dynasty, but I did see him on Dallas where he played Alex Ward. He was SOOOOOO dull and lacked so much charisma. I don't know if that was just him or the writers's fault, but either way the character just wasn't appealing.
All in all I liked Dennis Patrick as Paul, I thought it was a brilliant stroke of casting, too. Dennis was so fantastic played the despicable Jason McGuire, then went on to play the older, wiser and kinder Paul Stoddard later on. Shows you what a versitle actor he was.
(BTW Dennis also was on Dallas where he played so brillliantly the Ewing's sleazy banker Vaughn Leland).