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No, not everyone likes playing as humans.
The beginning is challenging and interesting, but then you start to relax.
Against a mage, skills that reflect magic and artifacts work well. I think it's better to play as a Warlock. As for the other races, I don't know. Maybe it will be much more difficult to play at the beginning. I played as a mage, didn't buy almost any army, he doesn't need it for a long time, and I also had good luck with development.