The difference between mild endorsement and a dismissive "ehh" technically isn't part of the movie. It's the 5-minute short subject preceding Continental Drift, a wordless gem titled The Longest Daycare starring Maggie Simpson.
Fossilized in a syrupy, always-stick-by-your-family-and-friends formula. Scrat provides the only constant humour. The surrealism and manic slapstick that animation can do so well are dwarfed by adventures with pirates and a clichéd teen-fitting-in story.