@Myoozik
I haven’t watched Adventure Time, Regular Show or Star Vs the forces of evil, but I watched Gravity Falls and Steven Universe and I think these two are absolutely fantastic. The difference, at least to me, is that all the episodes were building up to something interesting and great. And when it’s not, it’s either a really funny episode (in the case of Gravity Falls) or really wholesome (Steven Universe).
In the case of Steven Universe, my least favourite episodes were the first ones, because I didn’t get all that hype after seeing an episode about ice-cream or something. Then, the more I was watching, the more invested I was, trying to connect all the clues, all the dots and all the secrets of Rose Qwartz. There was a main goal, some characters with motivations, conflicts, goals, worlds, etc. And the 10 minutes length helps a lot, because if you didn’t like an episode, you could just ignore it. I think the only episode I didn’t like about the last seasons was that one about Steven Vs Amethyst. It wasn’t very interesting. But the rest was great, wholesome and even emotional.
About Gravity Falls, it’s a show that doesn’t lose its focus, not even for a second. I’m the type of person who thinks that “less is more”. And Gravity Falls perfectly shows that, with only 2 seasons, and it doesn’t need another one. It’s perfectly ended. I can’t even remember an episode that I didn’t like. This show combines all the stuff I love: comedy from The Simpsons, a world-building that reminds me of X-Files, a Disney style for kids and adults, funny lines, Stan in a nutshell, etc.
As much as I like MLP, this show doesn’t have that focus. When it wants to be ambitious, it’s only for 2 episodes out of 26 in one season. It doesn’t even have a natural or organic progression. When it shows some interesting concepts (such as Chrysalis and the changelings from season 2), the show ignores it until it’s too late to get hyped. Sometimes it wants to rush some episodes instead of giving some necessary development for some characters. And when it’s an slice of life episode, it’s a complete gamble. You never know if it’s gonna be a good episode, a boring episode or a bad episode. And when it wants to show some continuity or self-awareness, it’s only minor and selective.
I still think Friendship is Magic needed a person like Alex Hirsch or Rebecca Sugar, a person with a vision and able to put the show in one certain direction. Because of the lack of that person, I think MLP has a combination of specific problems related to continuity, organization, production, planning, world-building, character arc and repetition of ideas.