I've been a huge fan of True Blood since the first series aired (have not read the books), as it is one of the more original series to come out of the last decade. It is fair to say that series 5 is one of the weaker instalments of the franchise, however a bad episode of True Blood is still better than most things on T.V.
This series is still full of some very interesting story lines, with some great twists and action, especially in Pam's story line which I thought stole the show in this series, however like other reviews have suggested it is still fair to say that some of the other story lines, about the less interesting characters, were not as engaging. However every series has a few "filler" story lines and that should not distract from the fact the majority of the season is well scripted and produced staying true to the usual standards of HBO.
I won't start reviewing the different narratives in the series as I feel there is no need, however, if you are a fan of True Blood, ignore the 2 star reviews as they are completely unfair, yes this series is not as good as the other series of True Blood, however it is still a cracking series none the less, offering interesting debates about vampire religion and ethics, still offering us a some what social commentary of the western societies we live in today.