Well, for starters, you have to realize that you are watching a made for TV movie geared towards kids... and adults like me that might still like kid things. Otherwise you are going to kind of hate it.
And then you have to realize that it's an action comedy of the best sort of pulp narrative available or else, again, you're going to kind of hate it.
And then, it's total pulp trash so don't expect it to be historically accurate in any way.
What it is, is a fun movie made about a dork, a geek, a nerd, that gets thrust into the fantasy world that all Indiana Jones fans live in.
It's kind of Warehouse 13 only more Indiana Jones. It's kind of Friday the 13th the Series, only more comedy.
It's made for kids, it's made to be light and fun and it has Bob Newhart acting like an action hero.