Good review. I agree this was probably the worst episode of the 11th doctor (maybe even of the whole new series, but I would have to really think on that), however it did have one good aspect (well two, I did enjoy Ben Browder's role, but it needed more John Wayne references).
Matt Smith has never pulled off the dark doctor, and this was the first episode with him where I finally saw the rage that underlies the doctors comic front. As Jex is describing what he has done Smith's face takes on a dark cast and suddenly he pulls Jex out and plans throws him out to be killed. Only it isn't Jex the doctor is condemning, but himself.
The doctor has done many terrible things in the name of the greater good, and he hates himself for it. Hearing Jex's story might as well have been hearing how the doctor killed all the timelords and Daleks (well for a short time at least, the Daleks seem to be like cockroaches).
I loved how David Tennent could go from whimsical to rage so well, but Matt Smith has never been able to do that. In A good man goes to war that is what we should have seen, but instead he just joked around with everyone. He almost got mad at River, but not quite.
So while the episode overall was terrible, it was nice to see matt Smith improve his range as the doctor, and I hope we will see more of it.