Having played Disciples 2, and having played HOMM3 (which, according to all the rumors and hype, is quite the same as this new sequel), I must say they have a lot of differences between them. Disciples 2 is very much concentrated on one single party that is your heart and soul and must be saved at any cost (else all the experience goes to hell), and "grand strategy" is limited to a very individual scope. HOMM series take a wider look on grand strategy and all the cities can be developed (no super capital ala Disciples 2, though) to their own extent, more than one hero can actually be on the frontline (though a main hero is still a preferred strategy), units can be sacrificed for the sake of victory (no lv ups for the grunts), different "holding the empire" systems (Disciples being based on rods on strategic assets and cities to spread the green, while Heroes is, arguably, based on hero, or at least in later games parties of units, presence, protecting the mines and recruting grounds).
Nonetheless, at heart the games are quite the same: very good turn-based fantasy strategies where every choice matters. Although Disciples 2 is far more individual. To sum it up, you probably would like it; but to be safe, you should try HOMM3 first (it is hailed as the series' zenith, and the creators of this new one has deliberately been trying to create HOMM5 as "HOMM3's sequel") and see if you like it.
Talking about Disciples now have me wanting the Rise of the Elves expansion. Dangit!

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