I am a big Doctor Who fan. I come by it honestly; my dad was a fan as a child back when dinosaurs roamed the Earth. The show has a wonderful structure that allows the cast to rotate fairly frequently without majorly disrupting the show.
Series 7 Part 2 saw the introduction of a new Companion, Clara Oswald (Jenna-Louise Coleman). Coleman has a wonderful sprightly energy that plays well off of Matt Smith's fast-talking Doctor. At the same time, she's more vulnerable than most of the recent Companions. She's brave, but she lets her fear show.
I was disappointed with the first part of Series 7. I enjoyed it, but it felt like the character arcs for Amy Pond (Karen Gillian) and Rory Williams (Arthur Darvill) were already finished, as much as I loved the characters. Part 2 was a lovely bit of fresh air and one of the best runs of episodes the show has had in ages. I think "Cold War" was my favorite - stylish and a touch creepy.
If you haven't seen an episode of Doctor Who, this isn't the best season to jump in. Matt Smith's time as the Doctor is coming to an end, so his character arc is concluding. But I think this is a season fans can be happy with.