After the mildly disappointing Temple of Doom, Indiana Jones wrapped up the trilogy with an awesome film. It was an easy recipe: bring back ancient religious artifacts (in this case, the Holy Grail), bring back Nazis, and have lots of great fights and chase scenes (on a boat, on a tank, on motorbikes).
It's not near as great as Raiders of Lost Ark, but its still a very worthwhile sequel.
I can't wait to see how they wrap things up after ending the trilogy - but regardless, Indy 4 will be a monster hit no matter how which way the story goes.
8/10