My thoughts: if you own M&B don't buy warband.
I mean, if you are bored of M&B single player you will not find so many differences in Warband to keep you playing for long.
There's another faction but they are just like swadians in pajamas. You can create custom groups (infantry, archers and so on) but you cannot tell them how to fight. It's just: stand here or there, follow me, do as you please.
You end up exploiting game limitations instead of relying on "real" tactics. ie there is no "real" tactic against zombies from the ground (Reinforcements have arrived!).
The multiplayer is cool but I just can't squeeze fun from it (it's my fault, I guess)
I mean, what's the point of learning that you can't be stunned twice by a 2H weapon? I know knowledge is power but...
But, if you don't own M&B vanilla go buy Warband immediately. There are very few games so addicting...
