Lol in fairness, I was never a fan. I've seen them live and it was actually a good show but I liked the opening Act better: Trivium ( which was the 3rd time I saw them I think?) They also had Coheed and Cambria but eh, too progressive for my liking, despite a couple ok songs.
Slipknot came out right before I got out of highschool and I just looked at it as a Nu Metal version of KISS. It wasnt until maybe 2008-2010ish that I kinda warmed up to them a bit but anymore like you, could care less again lol
As for Corey, he's a person you want to like but then he puts his foot in his mouth and ruins it.