Potential overanalysis incoming
I'm going to preemptively call myself out for being overcritical.
There was a lot to like in this one: good animation, some nice humor, fun storyline, Equestria backstory, etc. Pinkie had some great bits 
But then a few parts just felt off. The cold open, which ended on a "haha oh that Pinkie" joke, or the chimney gag which felt really forced in terms of "wackiness". A few other moments felt off as well.
I know the counterpoint to all this is "children's show", and yeah, sure; but the whole point is the show has picked up a following in part for going a few steps beyond that in terms of cleverness and writing. It's a higher standard for a higher quality show.
Again, on the whole, I rather enjoyed this one, but I to say it kind of felt like this was a B level episode that could've been an A level episode with just a little cleanup. That may or may not be fair, but that's my read.
edit: also I don't care at all about the flag. Just write it off as a nationalistic thing to include the current flag or something
~*~Season 2 Tentative Ranking Station Subject to Change By My Discretion~*~
1. Lesson Zero
2. Sisterhooves Social
3. Secret Of My Excess
4. Sweet and Elite
5. May the Best Pet Win!
6. Hearth's Warming Eve
7. Luna Eclipsed
8. The Cutie Pox
9. The Mysterious Mare Do Well
It recently dawned on me that my signature could be interpreted as being said by me. For the record, this was not the case. If the previous signature reduced your opinion of me, please increase your opinion. Thank you.