The only unrealistic standard is assuming that just because MLP captured a perfect blend of characters in G4, they're going to manage it in every generation (as it is, generations 1-3 were sketchy at best). The new students in Twilight's school of Friendship are a prime example of the writer's attempts to create a new ensemble to flesh out the stories. Most of these new characters, in my opinion, suck. If that's any indication of the level of quality that's to be expected, I don't hold out much hope that G5 is going to be as great as G4. I hope they manage it and I'll keep an open mind. Either way, it doesn't have to be as good as G4 to be good. I'm just not going to assume anything until I see it.