I think it can be enjoyed by someone who has never seen the movie. The trolls introduce the Elsa and Anna characters, Olaf skating is cute, Sven with is tongue stuck is funny for kids, Olaf tells you that you're going to Elsa's ice castle, the Marshmallow scene reads well apart from the movie, etc.
Now I agree that Disney used the IP to make the ride popular and then skimped out on putting the time and money that would've moved it from a nice attraction into making a truly great attraction. In addition to the transition spaces I mentioned, I would've preferred more depth to some of the sets.