Did you expect an older Indy to act differently or be characterized differently than he was in KOTCS? I myself expected a grittier, more uncaring Jones. Something akin to a John Wayne or Bogart in Casablanca type of character or like, basically, an older, grumpier version of the guy we meet in Raiders. More cynical, more grumpy and easier to pull the trigger. Maybe even tottering on alcoholism. Think tough guy with a sad underside, similar to Clark Gable's character in The Misfits--an aged cowboy who is all middle aged old fashioned gruff masculinity, masking a sad interior.