I don't understand the problem with druzhinas, I really liked them and preferred them over boyars, the only unit that didn't come up to my expectations were thoseberdiche guys, I got the impression that dismounted druzhinas are better. Fighting the poles with russia was not a big problem and I also beat some mongols so...
About historical accuracy, I cannot say a lot, except that it's a game and if there are small inacurracies, I don't mind that.