You need to keep in mind which nations are built to use blood magic.
Abysia
-the Demonbred can use Blood Boil at reaserch-1 for a no-slave armor negating attack.
-Demonbred have exatly the right skill to cast Bind Devil.
-the Warlocks are tailor made to cast Hordes form hell.
-Hunting is made easy by the cheap Warlock Apprentice.
Mictlan
-Has blood-1 mages for easy/cheap hunting
-Starts with bind fiend and bind spine devil pre-researched
-Can upgrade national mages for easy access to many big blood summons
Pangaea
-Cross Breeding is cool.
-Awaken Dark Vines now very cheap for what you get.
Jotunheim
-Skratti have the correct skills to cast Bind Frost Fiend, and can be empowered to cast Bind Ice Devil.
-Illwinter is custom made for some serious Jotuheim domination.
Marignon [Diabolical Faith]
-Starts with Bind Harlequin, which isn't the greatest, but it's not bad.
-Has cheap blood-1 mage for easy/cheap hunting
-Like Abysia can use Blood Boil for battle.
-Like Abysia has the right skills for Bind Devil.
Vanheim
-Is a very minor blood nation... but I guess the Van could empower to be able to cast Bind Storm Demon.
Everyone else
-Isn't a blood nation and should need to spend some effort to garner power from a list that isn't natural for them.
You also must keep in mind that blood hunting is an economy that the player can control and cultivate. This is very powerful compared to gold and gems/sites which are limited in nature.
I'm actually happy to see blood magic reduced to the level it's at. In fact I still think it's a bit too potent due to the players ability to control the investment into the blood economy. Well that's my opinion, for what it's worth.
