While Might&Magic 6 and 7 are great games on their own, MM3 is one of the best CRPGs ever made and the best I ever played.
I'm surprised that "Heroes of Might and Magic" (which is totally different) was linked as similar game, MM3 should be linked to Might and Magic:"World of Xeen" which is the only slightly changed sequel (actually the combination of Might and Magic 4 and 5).