After, over 500 hours of the game. I can safely, with all definite possibilities, say that this is indeed a great game.
Whether you're a Lord, a commoner, a hunter, a mercenary, a lady rising to aristocratsy, a trader, a slaver, a crossbowman, a leader, a tactician. No matter who you want to be. This game can make you that person.
From fighting atop horses, to fighting on foot, to fighting in sieges, and land-battles. With swords, maces, axes, spears, javelins, bows, crossbows, hammers, picks, pikes, bills, throwing knives, quarterstaffs, even your bare fists - This game will let you do whatever you want to in a Feudal-Based world.
Set in a feudal-Medieval landscape, the same to it's predecessor - Mount And Blade, named Calradia - There will be much to do with much time to do it in. The continent is torn arift, with six rival faction-states all vying for power. Each with it's only courts, castles, cities and vassals (Of whom have quite the amount of family members, be they father, son, brother, sister, nephew, niece, uncle, aunty) -- You're character is free to roam, choosing entirely as to what your role will be in this epic-society.
Be who YOU want to be. Act how YOU want to act. Duels, pillaging, fighting, peace - These, and more, will be your weapons in the feudal life that is Warband. Marry for love, or for power. Become a king, queen, emporer, empress of your own kingdom, empire, rebellion - Help rival lordlings cure their hatreds, or help worsen them.
Now, that I've done the whole "THIS IS A GREAT GAME. BUY NOW." salesman-thing. Onto the actual points about the game, and whether I truly believe the game is worth it's £15 (Because, let's be honest. £14.99 is just £15). Yes. It is. Through my long-time with the game, it's safe to say that I've not even scratched the very surface of the game's entire potential. Being a mostly-singleplayer person, though multiplayer is highly recommended - What with the thousands (Yes. Thousands.) of servers for several of the community mods up, I would be certain to tell you - You will not even be able to contemplate just how many new characters I've made.
But ofcourse, there's the buggy side. In the hundreds of hours I've spent, of my life, on the game - I can say that it's nigh bug-free, and there are only a few that would be of any irritation. Such as the poor use of lances by NPCs, but then again - That's not a bug, that's just the AI right? However, keep in mind that this game is a total sandbox, and the four, maybe five, bugs that exist are (By extreme!) outweighed by the perfection, that is Warband.
Is the game worth it? No. It's worth more, mate.