I got sick of the show in the middle of the 4th season. It was great before that but it just kept getting crazier and that just got poopy for me.
I'm totally with you on that, I had to force myself to finish the 4th season and if I hadn't marathoned the 5th season at someones house, I probably wouldn't have watched it on my own.
However, the 6th season is phenomenal, definitely the best of the series imo.