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Sure, I will! But not only because the third installment is the most popular among all HEROES games.
Any good thing has a limit of saturation (political economy).
After playing Heroes 5, I will most likely return to the third game, or any other part... the main thing is to have motivation and time. I am currently playing Heroes 5, but nevertheless, in the last month, I managed to (in between Heroes 5) complete:
a tournament with the first map + two standard levels;
Heroes 4 WoW (3 campaign levels as Necropolis);
Heroes 3, one random map;
And a couple of days ago, I completed a tournament in Heroes 2.