I liked it too. I wasn't so sure during the first episode, but episode two was pretty good and of course 1 was necessary set-up. I thought they addressed a lot of things well; Twilight actually had to think about what it meant to be a Princess (and there was conflict with friends over it); the timeline of the Discord and Nightmare Moon history got put in context; Twilight had to deal with having wings; and as Ryffnah said, the Elements of Harmony got taken away. And this was done in a pretty clever way, with Applejack initially asserting the Elements were what would always keep them together, and later having to give them up.
The writing for Discord was actually pretty clever too. When he sort of tricked Twilight to going back all I could think was 'aw what a good friend', yet he kept open the possibility he was being nefarious. It seems like Discord would be able to fix everything at any time, so his friendship with the ponies has to be a pretty complicated issue if things are to stay interesting.