Jenna Louise-Coleman can act, is attractive, and has a ton of great chemistry with Matt Smith. BEST. COMPANION. EVER.
In all seriousness, with this episode I picked the third option, jolly good fun, as I liked the episode, but I've already forgotten about the snowmen plot. It seemed like that part of the episode kind of just stopped and they could have developed it a lot better.
This episode was mainly getting to know Clara, and how she and the Doctor work together. I liked seeing Vastra, Jenny and Strax again, but Colemen and Smith carried this episode and did it really really well. I'm really excited about the exploits they will have together and while I wish she was just "normal", I'm not bothered by her "mystery".
Oh, and when the Tardis lit up to show the new control room in all it's glory, I had a flashback in coolness factor to the first episode, Rose. Seeing the new Control Room was great, and this is a lot better than the old chaotic control room from the previous seasons. I really do wish they would explain the change though. I mean I know it's a desktop theme, but why does the Tardis change, and how? Just that entire scene when we see the Tardis again for the first time and everything is lit up and the look on Clara's face is one of my favorite Doctor Who scenes in a long long time. Really looking forward to the back half of the season.
As for the theme song, I was a little disappointed it was the same theme as the previous two seasons but the visuals just changed. I loved the visual change, but I really wish the actual theme was a little more simplistic (Like during the RTD era) than what we've gotten.