I've watched several episodes, and honestly, this is not a good show at all. My Melody is a very redundant character since she has the exact same sweet girl personality as Hello Kitty, who clearly isn't the main character the more you get into it. Instead, it is Dear Daniel, a Gary-Stu who could do no wrong. Watching him gets frustrating quickly. Pochacco and Keroppi aren't very interesting, although they do have flaws, and Badtz-Maru, the most three-dimensional character in the show, is always treated like garbage by the writers, almost always being the one to learn the lesson of the day. If your favorite Sanrio character is not Hello Kitty, My Melody, Dear Daniel, Badtz-Maru, Keroppi, or Pochacco, you're in for disappointment, as every other Sanrio character is either not present or in the background at all times.
Aside from the characters, the animation isn't great and the voice acting sounds like it was done by two people at most, even though it was not according to Wikipedia. If you want a show starring Hello Kitty and her other Sanrio friends, you're better off with Hello Kitty's Furry Tale Theatre.