True Blood is awesome! I wish the second season would come out on DVD faster so I could keep on watching it. The books are alright too though I think I prefer the show.

As to whether or not Louisiana is anything like that, I have no idea. I doubt it, but that's TV. The biggest stereotypes about the South in general are probably that everyone's ignorant, racist, and stuck in the past.

I did find some web-sites with a little more about the stereotypes if you're interested. They're not the most scholarly but I think they give a fairly good overview.
A Southern Primer: Truths, Untruths and Stereotypes
and TV Tropes about the Deep South