BF Ulm reminds me of Diabolic Faith Marignon (crossbows, pikemen, etc.) but with weaker mages and an actually useful starting blood summon. However, any power of Vampire Counts is really only early game, and using blood for early game expansion isn't so great, as blood magic tends to be slow starting.
Against human players archers can destroy thralls very quickly, and I'd bet a lvl 3 priest or two hiding behind some front units can kill a Count pretty easily...he can't resist smite demon forever.
I'm actually kinda curious how effective demons in general are now that there's another spell designed specifically to counter them, especially since it looks rather effective.