When the final season of the hills was announced by MTV, the shows creators made the statement that they felt that the story has been told. I could not agree more. It's very obvious that when Lauren Conrad left the show that it was destined to go down. The decision to bring Kristen Cavalleri to the show right after Lauren left was a move made in desperation. The novelty effect has worn off very quickly.
I am going to rate this season a 3/5. It's only semi-entertaining at best. The series has definitely reached it's expiration date. It's basic Hills: the gang getting drunk and going out, "drama" between whoever is having casual sex with Brody Jenner and who ever wants to or used to, random vacations where they all just party, Audrina dating random dirty looking guys, one girls talking about another girl behind their back regarding something petty, Heidi and Spencer "fighting", etc. It's worth watching for the hot body of Audrina Patridge, but not much else.
The best thing that the creators of the show could have done would have been to scrap the series after season 4's Heidi and Spencer wedding episode. I am convinced that if the series were to continue to a season 6 or 7 in it's current form that even the most hardcore Hills fan would agree.