I liked season one and season three for different reasons. The first season I loved because it was just sort of simple and cool, and nothing will ever be as scary as Rubber Man.
Season three was kind of silly and campy but I really enjoyed it and found it pretty entertaining. I loved Jessica Lange's character and loved the witchcraft theme.
Most people I know liked season two the best but I didn't love it - and I'm usually a HUGE fan of asylum stuff! I think it focused a bit too much on the gore and they just had a lot of stuff on the go at once. The aliens thing was still so strange and actually took away from the whole thing in my opinion.
So far this season is good, the first few episodes were kind of slow but it's picking up. I like the theme a lot and once again I love Jessica Lange's character.