I used to have a huge mixels hyperfixation in 2015-2016, I had almost all the toys and watched the cartoon everyday. I recently decided to rewatch it for nostalgia purposes and didn't really enjoy it as much as I used to, although that is understandable as I am obviously much older then when I was when I first watched it.
I didn't really laugh at the jokes as much, found some of the characters to be quite irritating and it felt kind of repetitive. Although I do think the newer, longer episodes were better and I feel like it could've become a genuinely good show if it wasn't cancelled so quick.
In short, I don't think it's at all a terrible show as I used to enjoy it so much, I'd say it's a pretty good if you have the right mindset for it. The toys are still good though.