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I liked the fourth installment from the very first screenshot.
Of course, it has many flaws.
But the game was released much earlier than planned. They simply didn't have time to finish it.
What I liked:
+ Simultaneous attack
+ Superbly crafted combat system
+ No upgrades
+ 3D battlefield. In the fifth game, it's still 2D.
+ Magic divided by factions
+ Each faction has its own unique characteristics
+ Caravans
+ Buy all button
+ Number of spells
+ Division into mass and non-mass spells
As for the opinion about the "terminator" heroes, I chopped them down like twigs. Dispel + sacrifice of a weak stack + attack with the whole group, and the hero is out of the game.