Ha ha ha!!!
I've heard of ICP but never listened to their music. I came across this movie and thoroughly enjoyed it. So yes a non-fan can enjoy this film. It's over-the-top cartoonish violent humor was spot on. The production value seemed legit. Casting was good. It seems the cast and crew had a great time making fun of themselves and it shows. Don't judge this film without first seeing it. I guarantee if you go into it with the perspective of it being a live action cartoon you'll get a lot more out of it.
"It's my head!" John Malkovich, Being John Malkovich