When I watched it wth my little sister, I was sort of disappointed. There was an obvious drop in quality when you compare it to the old LBT movies. It was really cheesy at some parts. I guess it's OK for little kids, but it's not an awesome movie.
While it does have a nice message and a star-studding appearence from a spinosaurus, LBT12 (like all the other LBT sequels) is very dumb and ONLY for the youngest of kids. The first film combined the talents of Don Bluth, Steven Spielberg and George Lucas, but all the other films threw them away. So I agree with nimill: if they want to make another good LBT movie, first they need to bring back don, steve and george, and then they have to make it more violent and dark, like the first. I'd give this a D+ at the very best.