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Personally I find this to be the best HoMM game since the 3rd, don't really get the bad rep it got which seems to be aimed mostly towards uplay rather than the game itself, it's a shame.
Unlike HoMM 5 the maps aren't nearly as linear (which was my biggest issue with the 5th entry)
Neither have I run into too many bugs other than the camera-bug which makes me unable to look around with my mouse and having to nagivate with the arrow-keys instead (only a reboot seems to fix this from my experience) but fortunately it doesn't occure too often.
Unlike the 3rd one you don't have the whole RNG randomness of skills whenever a hero lvls up, instead you get this RPG-esque option to put out talent points into either Magic or Might. The balance doesn't seem to be all there neither, might is a far superior choice over magic from what i've seen and the factions seems to be a bit unbalanced as well. There are less resources to think about, etc. You can also not steal mines in the same way you could previously since they are all connected to the owner of the nearby town so it's a bit less micro-heavy than previously as well. For some this might be a big issue.
While the overarching story might not be anything amazing (neither was any of the previous installment's stories) I still enjoyed the campaign a great deal, playing from the different perspectives of Duke Slava's children, one for each faction.
And honestly if you are into the story that much I'd recommend going for the Might & Magic series instead.
All in all, It's a fun game if you can look past the whole double-DRM thing and some changed core features such as less resources and how the whole territory-war works.