Anybody who has not experienced Tommy Wiseau's "The Room" has not yet lived. His directing and acting abilities are so bad that it's endearing.
Uwe Boll is also quite bad, but he shows some improvement here and there (I actually kinda liked the first half of Postal), and at least you come to know what to expect from him. I like the guy, though. I met him once and he's really nice as a person, even if his movies suck.
Joel Schumacher can be bad, but he can also be good, quite often in the same movie.
M. Night Shyamalan is bad, but I just don't even watch his movies, so he's irrelevant to me.
Michael Bay angers me the most because he is a huge waste of potential. Not only was Transformers 2 terrible save for about 2 scenes, but the depiction of Skids and Mudflap were so offensive that I get a good laugh out of it from sheer disbelief. I was about to forgive the movie for all sins provided that they delivered on giving us Devastator. The end result was tragic.
I have also refused to watch Pearl Harbour. I know some people might tell me that I can't criticize a movie that I haven't seen yet, so I won't. But I think it's fair of me to say that I can come to certain conclusions about the movie before even watching it, and those who have seen it confirmed my suspicions. If people actually told me that it was worth watching, I might have checked it out so I can form my own opinion, but I have been assured it was a waste of time.
Any and all who were responsible for movies like Meet the Spartans and Disaster Movie need to be shot. First in the balls, then in the kneecaps, then the elbows. Then, they should be left in the middle of the desert.