The good: Lots of characters to choose from. New body guard system system(only one bodyguard, but has more skills and special abilities, also easier then having 7 bubbling idiots following you as in previous version). Introduction of different base (attack\supply\defence), by destroying/occupying these bases can lower the morale of the enemy. Varied maps and objectives.
The bad: As always in dw games, theres alot of hack and slash, problem being theres not much enemy variety, so you'll find yourself hacking the same enemies over and over.
Overall: Quite good replayability, considering theres a huge amount of characters, if you don't enjoy hack/slash games, avoid this at all costs.