Weekend at Bobby's started off a bit misguided, and at first I was skeptical, but as it goes on it proves that it is a great episode, with enough storyline progression and humor.
This if the first episode where we see a glimpse of Bobby's actual life apart from the boys. I actually cannot believe that it took this long, and anyway, here are some very disturbing scenes (the demon execution in Bobby's basement0 and some very funny scenes (the woman). What I loved about the episode was the mention of what I consider to be the best horror film of the last decade- Drag Me To Hell. The first mention of it was in the demon that Sam and Dean were tracking down, the Lamia, and then a conversation between Bobby and the woman who is interested in him. It was a nice homage to the film, and in that element the episode also worked well as comedy.