Can you tell me what? The second campaign has no plot at all, and everything gradually transitions into the third. As for the third: how to kill Biara, the "Hammers of Fate" had more interesting campaigns..., but here... and the ending didn't please me either; they could have told us more, at least about Arantir, who mysteriously disappeared after the first campaign, or about Railag....
But overall, I'd give it a 9 out of 10 for the interesting Necromancer campaign and the new features.