Mount And Blade is "Pirates!" but on horseback. Assemble a ragtag team of peasants and pay them to fight at your command! Also be an ultimate badass, slaying oncoming barbarians by the dickload. Nothing is more satisfying than being the last man standing at the arena! I AM THE MOST DANGEROUS PERSON IN THE UNIVERSE.
though, prepare to be taken prisoner several thousand times before you get your bearings. (they took my horse!)
i got it for half price. i wouldn't pay more than $15 or so for the game. but it is surprising how complete and free your options are, even if the game is a little simple.
also, the lack of physical coinage in most town markets means that you have to trade your loot in for physical goods like ale and wool and furs, amassing your wealth that way rather than via kiddie pools full of glittering gold. a cute touch!