I know I'm possibly not the first, nor the last, but here's my take on the episode
My friend and I watched it, and we both straight up went crazy over the twists and turns that made up the two episodes. Moreso, we laughed over how Twilight had to sip the white potion three times and go into a trance without labeling it as a drug trip of sorts.
Discord, like in Keep Calm and Flutter On, straight up made the episode with his own twists and comical effect that was on par with Pinkie's; it was expected that the Mane Six still don't trust him at all.
What pissed me off would be the end: yet another freaking CLIFFHANGER!!!
No doubt the supposed keys will be found in the middle of the season leading up to the finale with either Discord doing a Face-Heel Turn or some other brilliant mastermind making an appearance as a potential villain. Whatever's in the box would possibly make for another OP weapon to replace the Elements.
Not to mention, the premiere also shattered several headcanons and fanfic concepts, mine included (Not that it isn't entirely a bad thing )
In retrospect, the writers did not disappoint, and I look forward to the 24 episodes that are on their way.