Awesome Art: The vibrant, lushly-painted backgrounds are gorgeous, while the character designs pay homage to the work of Beano artist Leo Baxendale as well as classic Nickelodeon characters.
Base-Breaking Character: The title character himself. Several viewers have criticized the character for his unappealing design, bland nasally voice, poorly-adapted personality, and in some episodes he acts like a total whiny jerk who gets away with everything. While some think that he gets crammed in every episode that does involve more with him rather than Zeke, Marsha, and most of the side characters, to the point where they rarely appear in almost most of the episodes, aside from appearing either minor or supporting role. (Judy has gotten this the worst of them all.) However, some people have grown on the character, no matter how bad his design or voice is, especially after the Season 1 finale.
Billy's design, voice, and behavior are highly questionable to the point where he's often viewed as a sociopathicJerkass who often bullies his friends.
It's Short, So It Sucks!: The series aired only thirteen 22 minute episodes and lasted less than two weeksnote June 3, 2017 to June 15, 2017.
Ron the Death Eater: The title character himself falls into this. While he is a Ditzy Genius and The Klutz, many people are making him out to look like a complete sociopath who likes to ruin things for fun and abuses his friends for his own amusement. (Which he never does in the actual show.) He's just a good natured kid with bouts of selfishness and naivety.
So Okay, It's Average: The show itself, isn't considered just bad or good, but rather just basic to most, despite of the main character having to be more or less favorable, most of those who watch the show tend to be more interested in Zeke, Marsha, and pretty much all of the Subterranea-Tania characters. However, in recent years people have started to look past the show's flaws and come to appreciate its' lighthearted, unpretentious tone.
They Wasted a Perfectly Good Character: Judy. She hardly got any spotlight and development and only ever made four appearances throughout Season 1. Her official debut episode ("Hey Judy") was her only major spotlight role, her second and third appearances ("The Mushroom Prince"note Which aired a day before her official debut episode. and "Rat's Entertainment!") were non-speaking cameos, and her last appearance ("The Battle for Subterranea-Tania") was a more semi-recurring role where she only had a few lines and didn't get too much spotlight here. The series' small fanbase expressed disappointment in how underused she was compared to most other side characters. It's gotten to the point where she the mascot of this trope. (Which is shared with Sam Lastnamè) Aaron Springer however declared that she would've gotten far more screentime had the show got picked up for a second season.