Because of the tradition for the nordic clergy to go to war I suppose... They were generally not very peaceful.

If they are 'just' another sort of heavy cavalry I think I will like them. If they are are small group of heavy cavalry with bonus to something, then I will like them too.
But anything like the BI priests and I will dislike them.

I would say that the Hungarian roster seems awfully strong. Lots of quality cavalry and nice enough infantry. But Battlefield Assassins and Pavise Spearmen??? Return of the Battlefield Ninjas (Hashishin doesn't count, they were lousy)? And Pavise Spearmen? What is going on there?