Young Indiana Jones:
IMO, the finest project that GL ever produced. I'd pick 'Oganga, Giver & Taker of Life" as the best Indy movie ever made.
Last Crusade:
As good as Raiders but with a plot & real characters.
Raiders of the Lost Ark:
The only 'classic' American film in the lot. A perfect action movie. But lacking in the emotional department.
Kingdom of the Crystal Skull:
Better script & storyline than Temple of Doom. A really fun, imaginative romp.
Temple of Doom:
The scariest & most intense of the series - my second favorite after LC, but on a scale, it lacks a strong story, has weak characters, and fizzes out at the end.