Mount and Blade is a 3D, open-ended, single-player, third- or first-person, computer role-playing game, created and distributed by the Turkish development house TaleWorlds. Mount and Blade has a medieval setting, without any fantasy elements. Mount and Blade is notable for its emphasis on realistic cavalry combat, which was common in the era, but is largely absent in most RPG titles.
Mount&Blade it's a Turkish independent game with bad graphics, grown up from a mean M$ Visual Studio test implementation named Dazubo.
If you aren't looking for a medieval sandbox game, move on. This is a love/hate relation. One of the features is uniqueness in its genre. And probably the cheapness it's an important factor.
Also, it works perfectly in almost every hardware from now to ten years ago.
Talking about modules, people says it's really Mod Friendly. That's not true. When you go deeper, you'll discover that you're really limited by a world of hard-coded stuff.
And this wouldn't be a problem if the devs weren't lazy-***** as hell. Basically they eat from the mod community, and don't like to make small&fast changes that gives us, the modders, a great freedom to accomplish the most awesome tasks.
Try the demo. But this doesn't deserve a single Denar from you.
That's only my opinion :)