I have seen the full series like 5 times over, literally. My fav seasons kept changing over and over and some because I watched them too many times over. It is my fav poker programme and really the only one I ever watched. I would still have to say season 4 remains the best because of it's overall entertainment.
In my current order from best to least best(?)
season 7 definately
I have hard time placing season 6 but it would be in my top 3 definately just not sure where