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That's the problem. The developers disregarded realism and proportions and started doing things "however they wanted." With strong contrasts and extremes. With such "toy-like" units, the epic spirit and grandeur of Heroes are lost. Heroes 5, in terms of music and graphics, is a pathetic parody of the 3rd installment.
Haven:
Now, all people are no taller than a dwarf. Peasants, Paladins, and the hero Knights themselves suffer from this the most. Archer-conquistadors. Inquisitors in idiotic robes with no less idiotic "censers." Griffin mutants with a solid helmet. Paladins don't bother with protective armor, or they wear helmets with eye slits that express "I'm stupid." Angels are armed with swords that can barely be called swords. You can only hurt yourself with them. And also, the unnecessary "anime" style of the main building in the city.
Sylvan:
The length of the ears is too exaggerated.
And I much prefer the elves from Tolkien – yes, they love nature, but they don't live in trees. They are an image of perfection in everything, a well-rounded being – they use bows, wield swords superbly, are skilled blacksmiths, mages, and simply cultured people. With a desire for peace.
The image of the elves here is an extreme. A city-tree, everything is green, and sometimes there is aggression towards the surroundings. In general, the implementation of the race is not bad, but the idea is too contrasting.
Dark Elves:
The revealing costumes of the Furies and Matrons are unnecessary vulgarity. Yes, dark elf women wear revealing costumes, but not to that extent! Perhaps it spoils the immersion in the world. Although it looks beautiful.
The city itself is executed at a 3 out of 5. In addition, there are again long ears and pretentiousness.
Demons:
A categorical disregard for proportions, the toy-like nature of the units does not contribute to the perception of the race as evil. The city has a gray interior.
Mages:
A contrasting Castle, but it is quite well done if you compare it to other races.
Necromancers:
Green, stinky breath is at least not suitable for a game. Skeletons and zombies are toy-like.
That is, the main problem with half of the races: the style chosen is toy-like, anime-like, unrealistic, but beautiful. That is, everything looks beautiful, but it terribly breaks the feeling of the game. You look at it as if it were a program, not as a Game, as the 3rd installment was.