This is one of those movies getting trashed by people without any good reason (just like Showgirls and Last Action Hero, which I both consider to be very entertaining movies). I’ve watched it a second time last night and was pleasantly surprised at how good it (still) is.
The acting is pretty good. There are no major plot holes. The number one “bad guy” wasn’t just some 1 dimensional asshole, but actually a well fleshed-out character, who was actually smarter (strategically) than the good guys.
Also, he effects weren’t bad at all for a movie with this kind of budget. And, another good reason for watching this, I got a good look at Katherine Heigl’s bare ass. 
I wasn’t bored for a single moment while watching Prince Valliant, and really what more could I ask for?
All in all, a very enjoyable movie, and I highly recommend watching it.
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