For me I was expecting it to be a bit crap. I was basing this on moffat continually leaving (or ignoring) loose ends throughout the last couple of series. Plots have been started and then stopped with lots of unanswered questions and a lot of the things he has done just make no sense within the storylines themselves.
So I was really pleased that this episode had a genuine beginning, middle and end that made sense. There was good interaction between the doctors, good nods to the previous 50 years and a storyline that worked in context. Moffat also did a good job at poking fun at himself with little asides about things (gimmicks) that fans get annoyed about (timey wimey, overuse of the sonic, childish doctors, kissing etc).
If I was being picky then the tom baker appearance didnt really work for me although it was nice to see him.