Ment
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It seems to me that the very way the question is posed in the topic suggests that it's not about discussing tactical and strategic possibilities, but rather about the appearance, composition, and other aspects. People don't vote for them because their originality ends with the urban architecture (although even that can be compared to Warcraft, for example). And demons are simply disliked; it's unlikely because they are unsuccessful, but rather because they are presented as the main evil, and at the same time, an image of losers is consistently created – there are many of them, and they seem dangerous, but they always lose disgracefully. In reality, both their city and their creatures are very successful in my opinion.