Quite frankly, there's a lot to like and a lot to hate about this episode. This episode was written by Charlotte Fullerton, who is (imo) the worst writer on the show, Betsy McGowen, who wrote for the utterly mediocre Johnny Test, and Meghan McCarthy, an excellent writer. Fullerton episodes usually have no regard for any logic or continuity, making episodes like May The Best Pet Win, Look Before You Sleep, and Putting Your Hoof Down some of the worst episodes of the show by having the characters act out of character, or let mean-spirited jokes take over an episode. Betsy McGowen is a writer for Johnny Test, which usually have logical problems (not to mention each character is a joke), and Meghan McCarthy has made some of the best episodes of the show, usually tying the loose ends of episodes together while also having clever humor and excellent character interaction. Unfortunately, this episode is exactly what I was afraid it would be for the reasons stated. Let me explain:
1. The Mane 6 are idiots: In the first half of the episode, they do learn their powers, but here's my problem with it: they aren't as stupid as the episode is making them out to be. To give an example, Rarity gets caught in a tornado and Spike tells her that whatever she thinks of will appear, and she spawns a tea set in the middle of flying around a tornado, a freaking tea set. That is how to make a character look like an idiot more than making them look like they don't know what to do.
2. Their powers (while making references to popular super heroes) are already things that they could do (Fluttershy is the ONLY exception). When you think about it, they can pull off their powers in real life. Rainbow Dash can create a tornado and control the weather, Applejack can use a rope effectively, Pinkie can run at an unusual speed, Twilight can use magic (she only has a freeze ray) and Rarity can create something from her imagination. Although I do appreciate that they are references to other superheroes, put creative twists on them, or better yet, make them different, then I could actually buy the ponies not knowing their powers.
3. The Mane-iac is cliched to the max. Sure, her background and design is a mix between the Joker and Doctor Octopus, but all she really does is laugh, has a long monologue, and tells Spike he's useless. Nothing else.
4. This episode has a huge lack of subtlety. The dialogue proves my point: "Oh Humdrum, why in all of Maretropolis would I use the hairspray way of doom on you?"
5. We've seen the moral before, twice even. These episodes are: The moral of Owl's Well that Ends Well, and when Spike looks through the door of Sombra's castle in The Crystal Empire. They involved Spike worrying about not being needed, and The Crystal Empire did it 8 times better and in less than 20 seconds.
I'm giving it a 6.5, because despite all of these flaws, it was an entertaining episode. For once Spike isn't annoying, and the superhero references were cool (I'm a sucker for superheroes, especially Marvel).