I'm going to start by listing first the things that I liked about that episode, so I don't end up having a mental breakdown before I can actually post this. Strax is funny. That guy who kept fainting was kinda funny I guess. I liked the end when Clara is back home.
Now, everything that was wrong with it *deep breath* : It seemed really repetitive, and the plot was just awful. I couldn't connect with the blind girl or feel any sympathy for her for some reason. He's relying on other people to save him way too much recently. It was resolved really badly I actually felt bored while she was shooting at them. The dialogue seemed really childish and repetitive "You're being really evil and I'm going to stop you!" kind of thing. This is quite possibly on a par with Rings of Akhaten for worst episodes of this series.
I'm really quite disappointed because the last episode was actually quite good, and now we've reverted back to stupid plot and annoying dialogue. The 50th anniversary episode had better be 1000 times better than this series, or I'm going to be extremely disappointed.