BB did get a little slow in the middle, but the last couple of seasons picked up again nicely, and it's rare that a show actually wraps up so well. I think they usually get dragged on way too long and the writers have to come up more and more ridiculous stuff just to keep a series alive, I like that BB seemed to have run it's course, so they had a big finale, and that was the end of it. Much better than fizzling out.
