I've seen the movie (Your Highness). I watched it with my wife. I didn't think much of it, and chances are if I had to choose between watching it again or smashing my fingers with a hammer, I'd go for smashing my fingers; though, admittedly, I do that sometimes accidentally. It's not that it was terrible, I just didn't care for it much, at all. I think I missed half of the "humor" by not knowing what I think they were trying to mock, but I'm not sure if it was just not funny at parts, or I wasn't getting it. I think I'd have to rate it as the worst "medieval" movie I've seen.
The best way I can think of to parallel it to something is if you've seen Friday the 13th, Nightmare on Elm Street, etc, and then watched the Scary Movie series, then it's funny. But if you haven't seen the movies that Scary Movie is mocking, a lot of the humor is just lost. That's how I felt for about half of this movie.