Definitely worth seeing in the theater, especially in 3-D. Once again, Pixar manages to amaze us with stunning animation- the level of detail this time is SUPER impressive, and while these days we expect them to bring inanimate objects to life in a realistic and human way, this third installment trumps them all- the characters seem more "alive" than ever before and the environments are incredible.
The storyline too is great, providing a satisfying ending to the franchise- not necessarily the tear-jerker I was expecting to encounter, but so sweet and endearing that if you don't get misty-eyed during the last 15 minutes then go to the doctor immediately because you have no heart.