Would you include the Wends in this group, Dragomir, or are they so different that they would need their own faction if we were to implement it?
I generally think the slavs are far underappreciated in history, I just remember the Obodrites (which were wendic) just like that pillaged Hedeby in 1068, and marched through contintental saxon territory for that

I also read that to some part their power in the baltic grew so much that even the swedes had to take precautions against their raids.
I personally think the only reason why they find so little regard is that their ancestors are so germanized (I am still talking about the Wends here) that they don't associate with them anymore at all, and thus they don't really have a "lobby" in modern historical perception...