M&B is definitely up there as one of the better medieval fantasy RPG’s, even if the story is a bit lacking. If you really want story, I recommend getting one of the mods for the game (of which there are many). Oh, and get the Warband version.
Besides M&B, the Witcher is another good pick, as well as the first Risen and any of the Elder Scrolls games (I’m loving ESO myself).
However, what I really have to recommend checking out is a game called Kingdom Come: Deliverance. It’s not your traditional fantasy game - there are no elves, magic, etc - but it is set in a ‘fantasy’ world, inspired by 15th century Europe (namely, the Holy Roman Empire). It’s absolutely fantastic-looking, although it hasn’t yet released. I highly recommend keeping an eye on it, though. They’re also cooperating with the folks making Star Citizen, if that helps lend any credibility.