What I have to say about this episode pretty much applies to every episode as of late: The premise of the episode isn't bad, the plot is decent, and there are some funny, classic moments, but too much of it is spoiled by things such as out of place sex jokes (or any sex joke in general), or any other joke or comment that makes you think "wtf?" or cringe. Case in point, the entire opening was loaded with this gross shit: Wolfcastle's wang, the Yes guy getting aroused by Marge's hair, some disgusting Homer scenes (all wrinkled, grabbing his fat collar, etc). Its this kind of crap that ruins the episodes for me. Well, that, and when they overkill a joke that wasn't funny to begin with, such as Sideshow Bob getting shocked.
The rest of the episode was pretty good stuff. The premise of this episode was actually pretty creative, IMO: Sideshow Bob actually helping the Simpsons. I enjoyed the old refferences, but they seem to try to hard to make reference to old episodes in every new episode, almost like "hey! Remember when the show kicked ass?" I thought it was odd that Marge mentioned Frank Grimes in the beginning, and it was cool that his son was the killer. But they should have ended the episode there, instead of stretching out that horrible musical scene, and they should not have begun with the needlessly long, horrible spa segment. For example, it should have begun with Homer having a normal day, and someone trying to kill him as he leaves work or something.
I just hate how they feel the need to shock and surprise the audience with a crude comment, image, or something as much as they can. If they didn't do that, I'd like the new episodes so much more.
3/5, 2 points off for the spa segment, lame ending, and crude, stupid jokes.