How many people who gave this a low rating watched the entire movie?
I can only assume that the people who gave this masterpiece a rating of 1 or 2 only saw the "first room" and those who rated it just a 3, 4, or 5 gave up after the first or second room. The movie gets much better after each segment. It's true that the first one is by far the weakest and that the second one isn't all that great either, but the 3rd and 4th segments are hilarious! You're really short-changing yourself by not watching the whole thing.
My vote history: http://us.imdb.com/mymovies/list?l=9354248