Warband is one of the most fun, addicting, versatile, replayable, moddable and user friendly games I have ever played. I bought it over a year ago and since then have played it for around 1100 hours in total according to my steam account, plus the time I spent offline on it and on my non-steam version that I use when steam crashes. It has a decent community and hundreds of user made mods. One of which was so good that the company that made the game payed the people to make it into an official DLC expansion.
I lead a regiment on the Mount and Blade:Napoleonic wars DLC and play it nearly every day. I would recommend it, and any other paradox interactive game, to anyone.