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1. A new world. There is no connection to the other parts of the series for the simple reason that Ubisoft refused to continue the evolution of the NWC world. Whether this is good or bad is hard to say, but at least the new world was developed in enough detail and is interesting. And the continuity of the series is achieved through the spirit of the series, not through the old world. Remember the failed HOMM 4, and you will understand me.
2. Graphics. Who said that 3D mode is a disadvantage? We can't just stand still and stagnate! As for the changed graphics of all the units, well, what did you expect? A new world means new units, and the "disadvantaged" 3D graphics work. And what didn't you like about the beautiful cutscenes?
3. Gameplay. I agree that there is a definite slowdown in the gameplay due to the 3D camera.
I disagree with the cancellation of turn-based combat. Where did you get that from? There are two modes - turn-based and dynamic - so choose whichever you like.
And there is a use for footprints - they show the strength of the army. For example, let's say we reveal a map with the Eye of the Mage - we see an enemy hero, he runs past and disappears into the fog of war - we can judge the strength of his army by his footprints, and accordingly, we already know what to expect from the enemy.
4. Unit upgrades. This is purely a tactical issue. Some units can and should be upgraded (beasts-furies), while others don't need to be upgraded at all (peasants-militia). And in general, an upgrade is an upgrade, which adds certain advantages to the monster, but is not mandatory. This has always been the case in all parts (except HOMM 4).
5. Plot. I don't see any contradictions in the plot (except for the story with the emerald dragons). Although there is a feeling of something unfinished, a sequel is definitely needed - those who have completed all the story campaigns will understand me.
The change of the main race of the Inferno castle from Krigans to Demons is due to the change of the game universe.
6. Special abilities of races. There are quite a few useless skills (Knight's Watch, Mark of the Cursed Demon Lord - I don't even use them). It is very difficult to upgrade the special abilities of heroes, and I don't even want to talk about the ultimate ability - it can only be upgraded in campaigns and on large maps, reaching level 30, which ultimately turns out to be useless and not worth the effort. Yes, there are many shortcomings here.
7. Magic. I don't see anything wrong with the fact that there are fewer spells. Instead, they are better developed.
Overall, the game turned out to be good, although it is not the 3rd HOMM. We wanted a new series, and we got it.