TheRightToArmBears said:
If you get into the lore from the old games you might be in for a surprise though, HoMM5/6 are in an entirely different universe.
Didn't that happen earlier in the series too, around about the 2/3 mark? I seem to remember there being something about an apocalyptic war and the destruction of somewhere-or-other (began with an E, had a lot of Griffins, I want to say Eternia but I'm pretty sure that was He-Man) that caused the survivors to head through a portal to another universe.
Of course, if you're into the lore aspects, you could always play the actual Might & Magic series. Veeeeery different, but AFAIK set within the same canon. Fun too, though I don't think I've played anything past M&M6.