I liked it. Definitely not as good as the wedding, but great epic vibe to the whole thing. The background music was a big part of that. Very cinematic sounding for TV, much less a kids show
Also a fair bit more lore/history, though even more new questions. Does anypony else think we need a couple movies or a spinoff series detailing Celestia and Luna's conquests 1000 years ago? Apparently they had as many villains back then as there seem to be cropping up now. Perhaps a 1000 year cycle, since that book Twiight was reading in the very first episode said that harmony had been maintained in Equestria ever since Luna's banishment?
An interesting tidbit I noticed is that unimportant looking stained glass window off to the side, depicting a round Earth with large oceans. Does that mean there are whole other continents that depend on Celestia and Luna raising the sun and moon on schedule? Or do the clouds around it mean that only that one area ever gets enough sunlight to support life?
It looks like Twilight is going to be in for some tough lessons from Luna, judging by that looming scowl after Celestia said "the next level of your studies". And Luna's book at the end... two stars and a spiral on it. Perhaps something written by Starswirl the Bearded?
I definitely get the feeling Celestia is grooming Twilight to become an alicorn (an idea I very much like, if it's done properly). I just really really hope it's not going to be a successor thing, as in dead Celestia. As a big Twilestia shipper, I hope it's as much about companionship as it is talent/destiny on Twilight's part. Celestia's gotta be lonely after 1000 years of ruling alone, constantly too busy to really make friends. At least she has Luna back now, but she has Twilight to thank for that, so it seems fitting for them to be a big happy family from now on
Not to mention, if Twilight remains mortal, Spike is going to outlive her by a longshot. Wouldn't it just be sooo awesome to do a series 1000 years in the future, about Celestia, Luna, Twilight, and full grown Spike's adventures with the next round of villains? Not that that would ever really happen, but at the very least I hope the series doesn't end with Twilight's ascension. That would be a total waste, alienating the fans who didn't want it to happen, and not giving the ones who did want it to happen any material beyond what they could have fanfic'd themselves anyway.
It's good to know more about Cadence, being the crystal princess. Still doesn't explain where she came from, since she looked younger when Twilight was younger, so apparently she was born/reincarnated/something recently. Doesn't explain why she was pre-cutie-mark-Twilight's foalsitter either. And I don't like that it means Shining Armor will be moving to the crystal empire, because that means he and Twilight will probably never live close to eachother again. Finalized his downgrade from BBBFF to BBBFUntilwegrowup
But Shining using his wife as a javelin, that was awesome