Try Mount and Blade, Rinkanu, search for the videos on google. It's multiplayer too. Also it's built around being modable to an extent, there are a whole lot of mods for it and it's very fun.
For example, you can be a mounted archer. I'm quite proud of what it turned into, as it's an example of how a game studio can make a good game and come out of no where to launch a successful company that hopefully will not run the route of a lot of a game companies. I managed to buy the beta for it when it was still cheap, and it was one of the best game purchases I've ever made as I paid 15$ for a game I played through it's development.
Also, look into realism mods, an awesome guy named Ron Losey started adding his knowledge to how weapons would work realistically, and he did a very good job. He is some kind of American professor teaching in China, or was for a while when he was working on the realism mod. He also had done basic studies like how effective is a type of axe against chainmail, vs a machete, vs other similar instruments and his insights made the game more fun as it was difficult yet balanced differently from Native M&B. He worked with a lot of the early mods and I hope the later mods have the same feel to them.
Also, it turns out that two handed axes are pretty much the weapon of choice for a strike against non defending dummy, against any type of armor, although a big hammer works too. Axes just have the weight and the cut and can go through kevlar easily if I remember correctly.