No Strings Attached is a "romantic comedy" about two friends attempting to be friends with benefits (or actually friends with only one benefit, namely sexual intercourse). I put romantic comedy in quotes because you would be hard-pressed to find any romance in this film and the comedic elements fall flat about as frequently as they succeed. Natalie Portman plays a weird girl who is uncomfortable with intimacy; throughout the entire film we never get a sense of why she is the way she is. Ashton Kutcher plays the same character he has played for the past 10 years in romantic comedies, and there was nothing new or unique about it the first time we saw it. As for the plot, it progresses predictably into disaster when one party wants more than just sex. Whatever will they do.
Movies like No Strings Attached really frustrate me. It's not the quality of the movie that I find irritating, but the fact that it has so much potential that it chooses to throw away on cheap jokes and superficial meaning. Natalie Portman is incredible in this movie; she gives her character as much depth and warmth as possible, but the character is just written so shallowly that her talent is wasted. Half of the jokes are hilarious, but the other half you could practically hear crickets chirp in the theater. It was painful how bad they were and I actually felt embarrassed for the movie. The relationship between the two main characters is absent until the ending (maybe I'm just being naive, but I thought you had to be friends before you could be friends with benefits). The movie itself is okay, and there are plenty of laughs (more than any Will Ferrell or Ben Stiller comedy that I've seen), but it just feels like a half a movie. I can't recommend it in good conscience.
IMDb link: http://www.imdb.com/title/tt1411238/