I went to a fancy preview screening (with fun and frolics in the foyer!). I really liked it. I guffawed in quite a few places. I especially like it in a kids film when they put stuff in that goes over the kids' heads and makes the adults laugh - there was a whole Braveheart thing going on... (The best film for that is Small Soldiers, in my opinion).
I think TF's review is a tad harsh. 3.5 stars from me.
Here's a link to Total Film's 3 star Ice Age 4 review