I just got back from a midnight showing of the new Indiana Jones movie. No surprise- it was a lot of fun. I was surprised, however, that the theater was almost completely packed. I like the kind of crowd who'd attend a midnight showing; they're the kind of people to applaud when actors first appear on the screen and applaud at various names in the closing credits. I'm not sure the movie did justice to its predecessors, unfortunately, but don't get me wrong- like I wrote, it was a lot of fun. I'm sure people will debate whether or not the ending sucked ;-) Modern special effects did set the movie apart visually from scenes like the melting heads of wax at the ark of the covenant. And I don't know how to emphasize this enough: Cate Blanchett was awesome.
Naturally, since Spielberg is a stickler for detail, the Crystal Skull has several connections to the original trilogy so you'll get more out of the movie if you've familiar with Jones' first three screen adventures. The movie also makes a couple of references to The Young Indiana Jones Chronicles. It also obliterates the continuity of the "old" Indy in that show. Perhaps that's why those scenes aren't in the recent DVD releases.
By the way, you're silly if you can't figure out the big plot twist involving Mutt.