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The plot is not much better than the nonsensical plot in Heroes 5, but the presentation of the plot has become much and significantly better, and that's what makes it enjoyable. It still doesn't reach the level of Might and Magic 3-7 and Heroes 2-4 in terms of plot (for example, the "soap opera" about the five Griffins still doesn't compare in scale and even tragedy to the global feud between Archibald and Roland in Heroes 2), but it's clear that Dansky and his team can still come up with something good. Of the characters, Kirill is the most likable. Of the siblings, Anton is perhaps the least likable, but this is more due to his often poor voice acting (he's only really good in the intro).
The graphics are much better than in the fifth game; there's no more of that unpleasant cartoonishness. The voice acting is good. By the way, does anyone else think that Christopher Walken voices the archangel Uriel? He even looks like him :D