Ok, I'll grant you that with the exception of the Spider-man trilogy that the rest of Raimi's out put fits in the "cult" end of the spectrum, but I think to call him a "shit" director oversteps the mark by quite some distance.
Ok he isn't the worlds greatest director but you have to admit he has a definate visual flair, and has acheived remarkable things on very limited budgets.
Yes Spider-man 3 was a stinker, but the fault doesn't lie in Raimi's limitations as a director. The script was the real weakness, and the fact that Raimi very much had Venom, a character he repeatedly said he had no interested in, pushed onto him clearly diminished his enthusiasim for the project. I think if 3 had of been just Sandman, and Harry as the new Goblin, it could possibly have been the best of the series, but alas we'll never know.