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In order of my rating:
1. Heroes of Might and Magic V, Nival's reskin of Heroes of Might and Magic III, which, nevertheless, in my opinion, surpassed the original. To be fair, I'm talking about the complete version of the game with the DLC. At release, Heroes V was buggy as hell.
2. Heroes of Might and Magic III. The game that made the series great, but also met an inglorious end. I associate it primarily with HotA and other global mods, because I can no longer play the original. It was Heroes III that gave me my nickname. Yes, that Astral with hypnosis.
3. Heroes of Might and Magic IV. The most beautiful part of the series, although Heroes of Might and Magic VI, with its stunning map level design, can compete with it in this regard. In fact, in terms of gameplay, it's the worst part of the series, but you can't argue with nostalgia.
4. Heroes of Might and Magic VI. A very beautiful game with a decent plot. At the same time, it's noticeably simplified, which is why it's not liked. If only the game had more content...
5. Heroes of Might and Magic II. In some ways, I like it even more than Heroes of Might and Magic III. I enjoyed playing it. By the way, there's a global mod that ports Heroes II to Heroes III.
6. Heroes of Might and Magic VII. A classic game in terms of gameplay, but with a terrible engine, gameplay, bugs, and a dubious plot (the plot in the DLC is decent). It could have been a great budget Heroes game, but Ubisoft once again showed its ingenuity and killed the series. I think that Heroes VII could have been third on the list if it had been polished, but we have what we have.
7. Heroes of Might and Magic I. Old-school, which, however, was not the first to lay the foundations of the mechanics. Its value is now questionable, although, in my opinion, in terms of the first parts of the series, Heroes I is better than, for example, Disciples I.
Additionally:
Dark Messiah is on my list of favorite games for its atmosphere and mechanics. Besides, it's a great game for BDSM with yourself in the role of a slave, because on a difficulty level higher than the lowest, it will subject you to humiliation and domination.
Heroes of Might and Magic X RPG. I didn't like the mechanics, or maybe the game was too difficult from the start, and I didn't get it. It's hard to say, because I tried it once and a long time ago. As for the series itself, I'm not such a fan of the original Heroes world to delve into the Might and Magic games, and as for Ashan, only Heroes X.