Despite myself I liked that movie...wonder what that says about me- toss the actors in mail and plate and you got me! Plus the love interest was a hottie.
I also like A Knight's Tale, even with the rock soundtrack.
It doesn't have to be historically accurate to be good or enjoyable. I especially like Van Helsing, which is one of those "plausible but excessively unlikely" movies ... but seriously, who DOESN'T want a repeating crossbow? And as you said with Black Knight, in Van Helsing, the love interest is a hottie too.
Wait a minute. I'm sensing a hollywood pattern here....
Pardon me, I'm headed back to the library of the castle posted above.