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Yes, the undead are interesting. I liked all the races 8)
Haven - for its interesting tactics
Academy - in every way 8)
Inferno - for the new gating and succubi
Necropolis - for great units and same new interesting abilities (the plague tent or the very useful ghosts in mines are worth mentioning)
Elves - for treants, hunters, and the ranger ability
Dungeon - for the best tactics of all the races in the game. Well... and... um... For some reason I really like the sound of the Fury's heels, it's kind of hypnotizing ))) Well, that' same a fetish or something, but I like it 8)
Anyway, once again I'm convinced: the game is a masterpiece. Bravo to the developers and... the composer))