The movie is definitely worth watching. It's definitely not as graphic as the critics made it out to be, but by the same token, it's not something you'd wanna watch with a house full of kids, either.
I actually ended up feeling sorry for Bob. Poor guy. He was a very wholesome family man, until he encountered this freaky guy. Freaky guy then rides Bob's coat tails, because the fact is, Bob Crane is the reason he's getting laid in the first place. Dude gets jealous and crazy, and well, I can't really tell you the rest, or it'll spoil the movie for ya.