I'm a HUGE fan of this show- I watch it as intently as my three-year-old does, enjoying the songs with equal vigor.
The animation is absolutely beautiful, with lovely saturation and contrast without being an eye sore, very much fitting of the "monster kids" aesthetic. The songs are catchy without being annoying, enticing my husband and I to start dancing alongside our preschooler. The characters are lovable, each with their own unique flaws and challenges and strengths, not only learning from their teachers but also teaching one another as only children can. The show emphasizes teamwork, friendship, manners, gentleness, and trying your best. Love it!