I think Alex Brown's review at Tor put it best: "These last few Governor-centric episodes have been entirely predicated on everyone around him being the dumbest people on the face of the earth."
Truth be told, I enjoyed this mid-season finale on a purely emotional level. I actually felt sad when Hershel died. Almost to the verge of tears. I'm not sure if that's saying much, though. I'm so easily moved even the most poorly conceived stories can affect me if they hit the right buttons.
The battle itself was fun to watch, but seemed very Hollywood.
The way Megan was bitten was so contrived as to come off as ridiculous. Plus how it took Lily watching Brian shoot her dead daughter in the head to finally decide, heeey, maybe this guy is bad news! Bah.

Then again this is the same woman who slept with him in a truck with her family right there; so her judgment is suspect, I suppose. >.>
Also, what was the deal with the girls abandoning Judith to become walker brunch? I expected Judith to die in the prison, but that just came off as nonsensical. Unless someone managed to sneak her away, I guess. The amount of blood suggests otherwise. Plus there was no chance of them showing an infant's corpse on basic cable. >.<
On the whole, I felt these last three episodes were the worst of this half season from a writing standpoint. It would've been more interesting had they gone with a redemption plot for the Governor. Not that I expected it to happen.
The mini-arc was a mess. Honestly, the plague on its own would have been enough to move everyone out of the prison had Rick and Carl failed in holding off the herd that busted through the fences. They should have brought the Governor back later on--in another way. I'm dreading seeing what they do with Negan now.
On a visceral, emotional level, I think Gimple is nailing it this season. On a storytelling level he isn't proving himself any better than Darabont or Mazzara. I'm not impressed by flashy zombie killing action sequences.