This installment of Indiana Jones stuck with all the elements that made the previous versions so lasting -- not too serious, a good mix of adventure and sci-fi, humor, double-crosses, a nod to the dual life of professor and adventurer, a youth element, a likeable heroine (Marion avoided the silly screaming that was so grating in Temple of Doom's heroine), and a greedy villain willing to do anything to win. An interesting story line and lush scenery round it off. The opening seemed bland at first, but led to an important surprise. It was a fast two hours and wrapped up some good details. There were fun references to '50's culture throughout. Most importantly, the main characters did change over time from the first installment to this one. Neither was pretending to be 20 years old -- I appreciated that!
There is no way to repeat the freshness of the first Indiana Jones -- once you've seen that one you have the main elements that carry forward into the others. This film was a good extension, not a reinvention. I don't think we need reinvention in this series, we just want to see how the adventures evolve. From my perspective, this film does its job well.