even without putting much effort here, I believe that you are not going to find relatively deep reviews about it. Maybe a few on MLP forums or a comment in EQD. Even by getting a sticky on /mlp/, it went directly off topic because...there is not much to comment over here. I didn´t have plans to do it but you went fully onto it so I have simply followed you.

There are more shorts so I guess that each one of them will focus on the rest of the mane 6. I bet that the last one will focus around Twilight´s progress.