And that's the best way to see this movie.
See it as soon as you can, before people tell you what happens, before you see too many clips, before reviewers give away all the secrets and plot twists, before people at work repeat all the best lines to you. I saw one extended trailer (I think it was before Eternal Sunshine), and read one article (in the Boston Globe)...and I wish I hadn't, because it was so much more fun to be surprised. So I don't have a lot to say about it but go see it NOW, before you get spoiled.
How many times is the second movie better than the first? Apart from Star Trek: The Wrath of Khan, not very often. But Shrek 2 blows its predessor out of the water. The technology has vastly improved, and there are moments you forget you're not watching live action. It's that well done. The subject matter is far more mature (what happens after "happily ever after"?), and we know the characters now, so they don't have to spent time on defining their personalites.
There are a few new characters, too...Puss in Boots is amazing and oh, so perfect. Not since Inigo Montoya and The Princess Bride has the big screen seen such a swashbuckling hero (what is it about Spanish swordsmen in medieval spoofs?) Antonio Banderas' voice suits him so well, too. Whoever was in charge of animating him really knows cats, because he is one of the best animations I've ever seen. He looks like a real cat in boots, not a cartoon cat at all. Absolutely brilliant.
There are so many little details, in-jokes, pop culture references (contemporary and classic), movie references, jabs at Disney and clever lines, I can't wait for the DVD so I can pause things and see them in slo-mo and watch it with the captions on so I catch all the dialog!
I'm definitely going to see it again in the theatre. I've already signed up to be notified when the DVD comes out.
Go see it...and sit through the first part of the end credits. There's a very important and hilarious bit at the end...but once it comes up, you can leave; there's nothing else after that.
Go see it. Sooner rather than later.