This game, while not amazing, is definitely worth a shot.
Guns are fun, if underwhelming. The switch to more tactical combat only ensures that the inadequacies of both the enemy AI and the tactics system come to the fore. Despite this, pistol drive-bys on horses are fun, along with peasant shooting.
The overall interface still needs work and progress made in Warband has been removed, along with a layer of diplomacy, no longer can you marry in game. The story missions are too vague and hard to find and too rigid for the flowing nature of the in-game world.
If you liked the earlier entries in the series, then by all means give this a try. Expect nothing truly special and moreover, expect to be exasperated when the peasants shoot you back!