I finally got to it!
The Isle of Scaly
Spike's back. And naturally with convenient memory loss. It makes me sad, thinking about the ponies who are dead though.
I don't really like the design of the dragons, how they don't have hand-claws anymore but weird elephant feet and how they all have the same basic hairstyle(and have hair at all).
Also I would think Spike would be a lot bigger considering his age.
Roots of All Evil
Opaline's been the mane villain for a long time but I still miss her and was hoping for more about alicorns. But it was a great episode. The show's really started to focus on Misty a lot and I like that but I thought Sunny was a little underpowered and didn't do a lot here.
Secrets of Starlight
Good new villains. When I saw them I was thinking Allura was just the muscle and Twitch was the mastermind. He seems a lot more intimidating than her. Allura reminds me a lot of a jacuin from Elena of Avalor.
I'm not sure about the auroracorns. Do we really need another type of pony at this point? I think you'd have to say magic has evolved and changed a lot in the time since FIM, even to the point of creating new types of ponies.
I'd say Starlight Ridge is the current version of the Crystal Empire. I hope so anyway. I like any connections between G5 with FIM. And I wonder if it has anything to do with Starlight Glimmer. That's really tenuous but hey, possible.