Don't know if any of you guys watched it but I thought it was great and perfect for the 50th anniversary. I've been an avid viewer since the 2005 re-boot but my dad has watched the show since the days of William Hartnell and he too thought it was great.
The best single scene from the episode and arguably one of the best from the history of the show: http://www.youtube.com/watch?v=Cn9yJrrm2tk
P.S, 2 of the best funny moments were when Smith's Doctor labelled the other 2 as sand shoes and grandad. Then when they all flew in to save Gallifrey, Smith shouted "Geronimo", Tennant "Allons-y" and Hurt "Oh for gods sake!" (Won't mean a lot unless you watch the show)
Brilliantly written and a worthy tribute to the show