It's best to compare Insane Clown Posse only to itself. To judge the outfit within the context of contemporary rap will lead to only one conclusion: The Posse sucks. Heck, they hardly even have any real songs. What ICP excels at is telling jokes and stories, and merchandising itself at a level that would make the original masters of greasepaint -- Kiss -- very proud.
The actual music is an afterthought, albeit a funny one. ICP's only virtuosity is in the art of the put-down. Take their riff on Eminem's mom, off 2000's Bizaar LP: "Every hair is like a foot long/Bitch look like a werewolf wearin' a thong."
You might laugh, you might not, but please don't take this seriously. If you do, the joke is most certainly on you.