It's a quite interesting universe, but it's not as rich as in Heroes 5 and 6. (Ashan) is likely less developed because it didn't have enough time to evolve. The story is described well, and I especially liked Lysander and Verzhik, as well as Alvin and the Pirate (I don't remember his name). I also liked the heroes from the fan-made campaign, or rather, from the Dragon Ring add-on: the Mage Rin, Lord Fyodor, and the Druidess Taela. It's a very interesting campaign, and the players did a great job.