Toy Story 3 has a short and forgettable main campaign, and that is definitely not the reason to be interested in this game. What you SHOULD pay attention to is Woody's Roundup, an open world adventure that exists inside of Toy Story 3. It's fun, different, and is loaded with lots of meaningful content. If you are at all interested in the Toy Story property, this is probably one of the better games to play.
For my full thoughts, check out the video review: https://www.youtube.com/watch?v=5l3-c_OhDbY&feature=youtu.be
Curator Page: http://store.steampowered.com/curator/31028489-Maddmike/?appid=373420