Not a bad episode, overall pretty average. I like the concept, but it felt like they didn't go with it. Matt Smith was great, especially in the final confrontation. As for Clara, I liked the character better in "Bells of St. John" than I did here. And I hope that dropping her back home at the end isn't going to be a regular thing.
Okay, is it me, or did it look like part of the console shifted/broke at the start. Right after Clara says "Something awesome" and the Doctor is running around the console, as it pulls back to an overhead shot it looks like a segment of the console shifts out of place.