It was ok, but nothing really special. I like Capaldi, but I'm not sure I like the why the Doctor is written. It seems like he's being written kind of as a bad child or something. I wanted a serious Doctor, but I didn't want a guy arguing with Robin Hood in a dungeon about having a plan. During those scenes I was thinking about to how Tennant and Smith's Doctors were always on top of the situation and, Tennant especially, always strategically getting out of whatever bad situation he was in. With the Doctor now, are we going to endure 20 minutes of arguing with someone before he actually does something?
Tennant's Doctor was pretty useless in Midnight and even with three Doctors in The Day Of The Doctor it took Clara to merely open the unlokced door to their cell. Personally I liked that the Doctor had to solve the problem without the sonic screwdriver.