I want to be as general as possible in this, as it's hard to talk about this movie without giving things away. Firstly, after movies such as Chronicles of Narnia, Lord of the Rings, and Eragon coming out, I expected Bridge to Terabithia to be a fantasy movie. It is not. It is a movie about imagination, friendship, and living through elementary school.
Despite the trailers for the movie not discussing any of that, (when do they ever show what a movie is really about?) I still enjoyed Bridge to Terabithia. It was better than a fantasy movie could be, because it was reality with an imagination.
This is definitely not the thing to watch if you're looking for a Chronicles of Narnia knock-off, because it's definitely not that. I expected it to be, but it's definitely its own movie. It's worth picking up for a buck at RedBox, for sure.
I wanted to say so much more, but I will keep it to the comments afterwards. Feel free to add what you thought when you watched it. Remember - do not go to the comments if you do not want spoilers. SPOILER ALERT IN COMMENTS.
Anyway, if someone posts something worth reading without a spoiler in it I might post it up here, if they say it's okay.