It's the little things that make it interesting. The air-riffs. The admitted Oedipal complex that goes nowhere. Various background interactions.
This is a movie that I shouldn't enjoy as much as I do, and I didn't really start enjoying it until the medieval ages. But the unapologetic stereotypical cliched depiction of historical characters and events; how they may act in the present (and by present I mean the rad late 80s). It's like some dudes similar to Bill and Ted who are metalheadee high school rejects actually wrote the screenplay. And I just can't be not entertained by it.
P.S. Dr. Who only wishes he had a phone booth as bitchin' as these guys'. Built by rock gods, operated by George Carlin. You can't top that.