Bridesmaids.
I liked it but was still disappointed. It was marketed as a female version of The Hangover, and received rave reviews. The first hour or so was certainly that, and I found it to be really funny, especially Melissa McCarthy's character. Unfortunately, the whole thing just goes off a cliff. They completely forget about most of the supporting characters, and turn the movie into a generic girlfriend flick, with an incredibly cheesy and borderline embarrassing ending. The ending alone killed any desire to see it again. 8 out of 10 for the first 90 minutes, and 4 out of 10 for the last half hour, so let's call it a 6.5 out of 10.