There were some missteps, but it embodied what I like in a DW episode. As usual they try to cram so much in 44 minutes that everything can't be fully developed but that's all I can really say negatively. I don't want to nitpick a fun episode.
I'm falling head over heels for Clara too. I didn't think it was possible for her to be so darn cute. After the Ponds, she's just what the Doctor needs. She reminds me of Martha but with more spunk.