It's all you expect from Burroughs: over-the-top manliness, bold adventure, hot babes with European features, inane romatic misdirections, shambling opponents of the lower races, and all the rest. This time, misadventure lands Julian (Our Hero) on - or rather, in the moon. `S hollow, y'know, but well-lit anyway. This time, Julian brings his nemesis with him in the experimental moon ship. I think this was to make sure there was a proper Earthian bad guy, since you can't trust those silly natives to be evil enough. Despite his treacherous sabotage, Orthis (the bad guy) is spared by Julian's chivalry and sense of fair play. And by the author's need to keep the evil-doer ready at hand, for when Julian runs out of warlike but inept natives to fight.
Of course, the romantic misunderstanding is resolved in the end, leaving one to wonder at the Burroughsian world where princesses seem to drop from the trees like nuts in the fall. Not all is well in the end, though, since we need plenty of setup for the sequel so obviously required.
If this were a movie, I'd say wait for a rainy Saturday and a bucket of popcorn. It's a book, but you get the idea. It's wonderful, bold, and (to a modern reader) more than a little campy.
But I mean that in a nice way.