I hadn't seen the first two, but... it was just really well done for a movie that was targeted towards kids. Well worth the cost of the $15 3D-version ticket.
And... I couldn't have predicted the ending. Looking back, it's obvious, but while I was 90% sure everything would have to work out ok, I just didn't know which path of "ok" Pixar was going to use, and I wasn't sure how they would resolve the flaming problem the toys got thrown into.
It was beautiful.
The wall street journal review covers it pretty well, but I don't have a permanent link, unfortunately. It has spoilers, so you probably shouldn't read it anyways. http://online.wsj.com/article/film_review.html (Probably only valid for this week.)