Anvilicious: The science motif is not subtle, especially when it comes to the characters' surnames.
Base-Breaking Character: The portrayal of most of the main cast (except for McKeyla) have been criticized for being shallow and ditzy caricatures of girls, their only saving point being coincidentally having competent STEAM skills. Adrienne and Bryden get the most criticism for enforcing stereotypes that girls are obsessed with fashion and social media.
Broken Base: How much of "STEAM" does the show actually explain and demonstrate? Is it a thinly-veiled attempt to market fashion dolls and gendered products under the guise of science and technology?
The toys that were marketed were also criticized for being too gendered and stereotypical, as the products come off as more "science for girls" than "science, for girls." It doesn't help that according to several reviews on sites like Amazon, a lot of them are poorly made.
Idiot Plot: McKeyla got hit with the Idiot Ball hard on her way home, with three girls following her to her house in plain view. Sure, she was wearing earphones and had known they were following her the entire time, but it still doesn't make sense why someone with years of spy training would be careless enough to leave her first-floor window open.
"PROJECT EM-SEE-SQUARRRRED!!!" from the Ending Theme. This one line played in the beginning of every single one of their YouTube videos and got annoying if you watched them in succession.
The constant "Go, us! Go, us!" cheer gets irritating and treads into the Narm territory. It's especially worse in the fact that it comes off as Totally Radical and hasn't been a thing since the mid-2000s.
Narm: The whole series is ridiculous for many viewers, as it tries to be a girl-power Edutainment Show with very little in the way of actual educational content, coupled with a lot of examples of Idiot Plot, consistent bad writing, and Large Ham acting.
So Bad, It's Good: The writing in the series is really terrible (unless you're in the target demographic), but the ridiculousness of it all has a bit of Narm Charm and is goofy in its own way.
Strawman Has a Point: Adrienne, Bryden, and Camryn are at fault for letting the prince be captured and not taking the mission seriously, but the series also tries to paint McKeyla with the same brush, as though she's at fault for being too harsh on the girls on their first mission. It's hard to sympathize with the other three girls when McKeyla is actually right, and that some people aren't meant to be secret operatives no matter how skilled they are, especially if they are endangering the lives of innocent people.
What an Idiot!: While McKeyla is concerned about protecting Prince Xander, Adrienne gets distracted making molecular spaghetti, Bryden is tweeting away about hanging out with him despite that the mission is supposed to be secret, and Camryn is way too fascinated about the party instead of keeping an eye on him. Guess how well the mission goes?