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What are you talking about? The plot in Heroes (all parts) is terrible, and to say that the RPG series started after the strategy game is complete nonsense. Heroes 5 is the peak of the series as a strategy game. Here, they talk about the atmosphere lost in the fifth installment, but the atmosphere was lost starting with the third part. In general, Heroes is primarily a strategy game, and if you want to enjoy the atmosphere of the Might and Magic universe, you should play Might and Magic, not Heroes (unless it's the second or first game...).
And by the way, regarding the "old-timers" who say that the third part is a spoiled second part with a few good innovations (specializations, the underground level of the map), I'm not an old-timer (I'm almost 14), but I also think so.
Added 2 minutes later
Where in Heroes, besides Chronicles, is there a plot other than "give the main villain a beating"? Even in SoD and AB, the plot isn't really like that. And Chronicles is generally an apocrypha.