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Well, in my opinion, graphics aren't the most important thing, but nevertheless, they squeezed EVERYTHING they could out of the engine of the fifth Heroes game, and they squeezed it neatly into a prepared glass.
My favorite part of the Heroes series... I hadn't seen many people playing Heroes before, so I was ready to play any part of the game, even the dumbest mod (unfortunately, there are some), but the best ones are definitely 3, 4, and 5. Why not 1 and 2?
1 is a bit primitive (very good and complete, perhaps), but it's as if some pieces were removed from chess... I honestly don't remember the plot...
2 is good, but why play the second one when there's the third?
3, yes. :) Justification... well... let's just say: it's ideal.
4 is an attempt to deviate from the beaten path while plunging the beloved lands into one big icy armageddon (if I remember correctly). But it's not bad. But it doesn't quite work. :)
5 is another new world (by the way, what happened to the old one?), it's good, not like the third one, but different!... It's worth saying again that the graphics are good, although it's unlikely that any of the Heroes fans put graphics above everything else. An attempt to return to the third game? A little bit... something new and brilliant. Although it's hard to play, maybe because the third game's system has already been fully mastered, and here they offer something different... it takes a lot of time to get used to it.
3 and 5 are the best, 4 is not bad (just for general knowledge), 2 is like a history textbook, and 1 shouldn't be thought of as something bad, it's just that now it seems like... a beta version of the third game. :)