I like the show a lot but ask myself WHY all the time. It's the same exact show each time! A ton of false diagnoses, Sarcoidosis is mentioned, someone pisses blood in their bed, then House finally gets the diagnosis right. I usually hate repetitive procedural shows.
I eventually just decided I can't stay away from a show about a hardcore athiest cynic asshole, who is a total dick to everyone non-stop, exposes every naivety they might have, and they love him for it. House is great because he's a master troll.