Birthright feels like one of the older fantasy (or even faerie tale) stories come to life.
Due to the death of the old gods, divine power was distributed amongst many people at a massive battle. All those descended from all but Azrai have a chance to have special abilities called "blood abilities". These can be stolen through certain means, giving a Highlander type vibe.
The old followers of Azrai get tainted bloodlines and become unique monsters. The Gorgon is different from your typical D&D gorgon, though his children become them. The Banshee is an awnsheigh (the term for these beings) who during the day is kind, but at night her tainted spirit leaves her body and attacks others. This allows for epic battles or campaigns against giant monsters. Not all of these are sentient, either, but many of them have to be killed in specific ways or they come back.
Elves are immortal atheists who can use magic without being blooded. I didn't mention that, did I? The only way to be a mage is to either be an elf or be blooded. If you're an unblooded human, you actually use a really cool 2e class called the magician which is like Pug in Magician: Apprentice, which is essentially a thief without skills and limited to enchantment and divination as specialities.
The human kingdoms are divided amongst a Byzantine-Norman French empire (fallen), a Celtic Viking area, a Hanseatic league analogue of German pirates, Slavic-Mongols in the tundra, and Persian magic users in the deserts. The German pirate area also had a new rogue class called the Guilder which was less thief and more merchant swashbuckler.
Realms magic is the most powerful magic, can only be cast by blooded characters, and take a realm turn (one season) to cast. This is stuff like mass plagues, armies of undead, and so forth.
Halflings come from a shadow world that's like faerie, and can disappear.
Personally, I think the world is more interesting than the domain rulership part, but YMMV.