Building on the original title the ceators have made Mount and Blade Warband a much more responsive enviroment. There are factions within factions and every action you make has consequenses. A fantastic revamp and upgrade on the original, without losing any of its charm. So many areas have been attended too including the trade system, weapons, armour, A.I in general is just a lot better.
Multiplayer – nice addition. I have found that there are few nz servers/players on Steam and when you do play inline it is ridiculously hard – Timing is everything and is different from the single player game. I have found it not uncommon for one person to have 40 kills to one death. Hacking comes to mind but it is probably because the person has spent 100's of hours playing nothing but Warband multiplayer.
Overall the new features alone are reason enough to buy the game and the multi player aspect is a good system if you have the time to relearn how to fight.