Saw this tonight and it was thoroughly enjoyable.
I was a big fan of the original and when I read some of the reviews for the remake I was worried,however I think the critics were overly harsh.
It is a bit short at ~100 mins to the credits ,it could have done with another 20 mins to help the story.
The cgi was good,the action scenes were well shot ,the score was good and the acting was good for most characters (Apart from Sam Worthington ,who is a dreadful actor with only one facial expression ,anger)
The 3D effect was a farce though,it was useless .
I cant understand why the film is receiving such poor reviews ,its better than most of the summer blockbusters I have seen over the last few years.