I might as well start off by saying that I've been a fan of Doctor Who for about 30 years. It's been my favorite TV show for much of that time, so while you might think Doctor Who in Time and Space: Essays on Themes, Characters, History and Fandom, 1963-2012 (Critical Explorations in Science Fiction and Fantasy) would be a good match for me, you'd be wrong. Sure, a collection of essays about my favorite TV show sounds interesting, but the book isn't.
Don't get me wrong, Doctor Who in Time and Space isn't a bad book, though it does have it's flaws. The main problem I had is that the style of the essays is a bit too dry. The book seems more suited for a more academic class of Whovian. Don't get me wrong; the essays are interesting, but they're not really for the casual fan.
Plus, as I said, there are flaws. Firstly, the book spends far more time on the new series than on the classic version, despite there being more than three times as much classic Doctor Who as new Who.
Another problem is that the book is already dated. This isn't surprising since there is no possible way the book could include essays on the most recent season. However, the final essay "Chasing Amy," which is a study of companion Amy Pond, seems a bit odd as it only includes information from her first season.
If you're a Whovian who would like to read a collection of academic essays on the show, then pick this up, but if you're just a casual fan, you might as well pass on it.