This film is definitely one to watch if you're a fan of special effects and CGI. Even in a film nearly 10 years old they are stunning and don't disappoint.
Unfortunately the plot is not comparable to the visuals. It just doesn't express the enormity of the situation of the new ice age and focuses instead on a fairly dull "father-son separation" scenario. The acting is generally good but nothing to write home about - the Dick Cheney lookalike playing the VP should be singled out for praise.
Overall a good one for effects fans, otherwise nothing to write home about.