HoMM2 is a masterclass in combining overworld map with tactical combat and RPG continuity and progression. Other than its sequel, HoMM3, no other game has done it better. There are some old contrivances which would not be in a modern version of the game but aren't enough to dissolve the strength of the core gameplay elements. If you are wanting to know how the genre of roleplaying tactical combat games was born, play this above all others.