I've never watched 90210, so I'm not qualified to comment, but I don't believe in guilty pleasures. If I enjoy something -- if I am entertained by it -- then screw guilt. Guilt doesn't belong in the equation.Is it very bad to consider 90210 one's guilty pleasure?
To Heimchen: the only reliable way to find out if you'll like something is to experience it yourself; everything you get by other means is going to be filtered through someone else's perception of it (especially when that someone is giving you "Oh, teh noes! It's like 90210!!!1one!" as a reason not to see it.)
Go see the movie. Then, you'll know whether you like it or not.