I usually let Rotten Tomatoes choose. If all is equal I usually let my DH of 16 years off the hook with Romantic Comedies, he has a much lower threshold for that sort of compromise than I do. For example, over the weekend "WE" saw Zombieland, which I liked very much because I love a funny black comedy. Not to say I don't adore a good tear jerker, I do, but I watched "The boys are back" and "Four Christmases" by myself because him falling asleep would only have ruined it for me, KWIM. Still, to each their own. I think we're taking the kids to see Lightening thief this weekend.
have fun!