Hm, well out of the ones I saw in 2009, I really liked Up and Orphan.
Up was an amazing Pixar movie which was entertaining for both children and adults. Also, like a lot of the good disney movies, it has it's really sad moments. I honestly didn't find anything wrong with this movie when I watched it.
Orphan, which I don't think anyone has mentioned yet, was also a very good movie in 2009, and it's one of my favourites. While the trailer made it look like some shitty horror movie, it's really not. It's a lot more of a drama than a horror (which would explain why it's not shitty, like a lot of recent horror movies have been). In this movie, I actually fear for the life of the family, and it doesn't just have meaningless killing like some zombie movies do. The villain is also awesome too. I also love the acting in this movie, especially since a lot of the actors aren't big stars, and there are a lot of child actors here who are just starting out. They all do their job very well, especially since the little kids actually act like kids, and the adults are being adults. While I know not many people would say it's the best movie of 2009, I would say it's definitely my favourite of 2009.