I didn't really enjoy the episode. Heavy on action, yes, but it relied only on Duke's monologue to give any kind of story. Since I'm familiar with GI Joe, I can understand what's going on, but as the first episode of a series, they really should have added more story. Who are these characters? What's up with the Shiny-headed guy and the BDSM chick? Where'd that castle come from?
Those are all questions I'm sure some kids must have (except for the BDSM part) that might have made the episode confusing, but at least the action made up for it!
EDIT: The episode on Thursday was a preview. The series officially airs Saturday the 9th at 12:30 Eastern.