Endless Eight sucks and that's why this show gets a 4 stars.
Now that I got that off my chest, time for the actual review.
The Melancholy of Haruhi Suzumiya is a lot of things. To list them out it would be something like Comedy, Mystery, Parody, School, Sci-Fi, Slice of Life, etc. The main gist you should know is that if Haruhi wishes for it to happen, it will happen, that means for her