Can't speak for the others, but I never like it as much as others of its ilk like Age of Wonders or even Master of Magic. Buying units till I had a horde of them in my army was nice at first, but never appealed to me as much as building one unit at a time like in AOW, MoM or the others.
Don't get me wrong, I still enjoyed it a lot. But never as much as the others.
I did not care for Heroes V at all. I'll replay Heroes IV before I'll try that one again. Although, I did enjoy the Necropolis Campaign. I would have preferred a less traditional type of Necropolis campaign like they did in Heroes IV. I Loved Half Dead's campaign because it wasn't the usual "LICH'S RULZ" campaign.
I still have both of the expansion packs for Heroes V, but they remain on my shelves never been played. Maybe I should at least play them once.