I didn't like Celestial Advice; I'm sorry, I know many will disagree, but that's me.
Discord's pressuring Twilight to state that she had big plans for Glimmer was more grating than amusing, and went against much of his character showcased throughout the last few seasons and especially the Season Six finale. Worse still, the episode just wasn't that interesting - Twilight and Celestia huddled together in that one room just pondering for ten minutes didn't make for a very exciting story, in my opinion.
Worst of all, that whole section was rendered utterly pointless at the end when Twilight decides not to send Starlight anywhere. What an abrupt ending!! As I said, it made the main focus of the narrative feel worthless and it's not like there was much else that stood out particularly elsewhere, either