I think the low raters are nit picking. I liked it. Sure the story was light but it wasn't bad and the action was great. I agree that it would have been nice to have original cast together but Kate was the most visible and important and she doesn't disappoint one bit. Go see it.
Definately one to go see in the theatre! Enough language and sexually provocative enough to earn every year of 13 and maybe more. Action scenes and effects were excellent. Critics that forget that this is a robots bashing each other film should be dismissed. If you liked the first you will love this movie.