Quoted from krupa:
That's pretty much it.
Gene had the marketing brains and Paul could perform but Ace brought the rock n' roll cred to Kiss.
Gene's been forgetting his own lyrics since the 70's and he's never had a drink in his life.
Crap... I just outted myself as a Kiss dork.
I don't know about the 70's, but he has butcher the lyrics to I Love it Loud since the late 90's. Every version I have heard he messes it up. I think he does it on purpose now.