Engaging plot with expected but well executed "nostalgic" look. At times, actually thought-provoking.
Good period details and fun, original (!) action sequences (although, how do the bad guys still manage to miss our heroes with all those automatic machine guns?)
Cate Blanchett is well cast, and while my initial reaction to seeing Karen Allen was "mercy casting", she manages to pull it off (what a great smile!) and helps to bring the Indiana Jones saga full circle.
Minor continuity lapses don't mar the overall enjoyment.
Pay attention to the PG-13 rating; plenty of nightmare fodder, and the crystal skull even started to draw ME into it's thrall!