I actually love season 4 because of his memory loss. Or, Eric. You're too good for Sookie.
Season 4 spoilerI love when he eats Claudine that bitch and then gets drunk/high. Lolololol. And he slaps Sookie on the ass and she's just like WHAT THE smurf ARE YOU DOING???
I didn't care much for season 4 for the witch coven story, though. Although Bill as King of Louisiana is just smurfing amazing.
Season 6 has been really, really good this season. As I said before, they're trimming the fat with stories that go nowhere and have no significance to the plot, which is really, really nice. Best season since season 3.