True Blood turned to crap long before the pitiful series finale, and that was thanks in large part to the death of Tara aka one of the best characters. Tara's relationship with Pam was going to strength to strength when she was killed off in a pretty nonsensical way.
Sookie killed Bill because it hurt him that she couldn't live a normal life or something. She moved on with some random dude several years later and seemed happier than she's ever been. It was like the previous seven seasons did not exist. Slap in the face? Totally.