It's not rubbish. It's just not worth buying. Dull, uninspiring, not very tactical and not very long either. And the siege levels are just ridiculous, timed attacks on a fortification make no sense and the pathfinding in buildings is woeful, my archers spent entire missions running up and down the same flight of stairs.
But then, I'm a warhammer obsessive so I had to have it, and it's not totally bad. The old ones are better though. Do not under any circumstances buy the box set.