I'll watch anything, except those Date Movie, Dance Flick sort of things. I've watched that sort of film and find the Wayan's comedy a bit abusive, like they're telling you it's funny, even though it clearly isn't. Funnily enough, I liked their stuff before they did Scary movie.
Actually, I may even watch them if I'm ever unable to access anything else, or if I'm with kiRAB.
I don't feel the need to see Mamma Mia since I saw the trailer. Pretty much told me the plot.