I found the first episode of MLP: FIM through deviantArt, and it was great (aside from the cutesy mumbo). All other current day children cartoons pale in comparison. Why? Because the source of humor in them is random crap.
Take Chowder for example. Last time I watched an episode it was about the main character making trash for weird black things with exaggerated expressions and blunt violence. The Grim Adventures of Billy and Mandy episode I tuned into recently starting with an animation of a dog with snot pouring out its nose. And for a later night cartoon I watched, Robot Chicken is just plain awful. It's literally nothing more then 5 second clips of a celebrity dying horribly.
The smooth animation, great plot, great music, and everything in general about it is great. It would be the perfect show if it wasn't for the cutesy mumbo