I have to say I was extremely disappointed with Crystal Skulls (is that the correct shortened version? It's not as easy as 'Last Crusade' and 'Raiders' and so on).
Generally I felt the film was just a series of unexciting fight/chase scenes, many of which went on for too long. These were held together by a crap plot that sadly lacked the historical element of previous Indy films. In short, there was just nothing there that hadn't been done already in the earlier movies, and done much better. There were even some scenes that were too ludicrous even for an Indy film. The unbelievably dumb 'Tarzan' scene springs to mind. Harrison Ford was as good as ever, but the other characters were dull. I wasn't totally convinced by Shia LaBeouf as Indy's sidekick either.
A big disappointment overall. There's bound to be more films to come, probably with LaBeouf as the main protagonist when Indy hangs up his whip. Hopefully they'll be better than this.