We went to see Ice Age 2 last night I would give it a 7 or 8 out of 10. Obviously the movie doesn't break any new ground and won't change your life. If you go to a movie like Ice Age 2 and expect this to happen, though, you probably don't follow movies very much.
That said, I did enjoy the movie. Any movie that looks that good (the CGI animation) and makes me smile is worth the $6 for the movie ticket. There were a few new characters in this one, such as the possum brothers who added to the fun of the film. I also enjoyed the little saber-toothed squirrel, Scrat, who was still trying to eat the elusive acorn.
The movie is a buddy film with the main characters sticking together to reach their goal. They whole time I was watching the movie I was trying to come up with story ideas. You never know where you will find inspiration.
I recommend the movie to anyone looking to forget their worries for an hour while watching a well crafted movie. Just don't expect it to break any new ground.