Starts out as a fun relaxing throwback to your childhood cartoon times, and is always creative and entertaining although sometimes you can guess where things might be going. Some of the characters you grow to really hate because of how annoying/stupid/etc they are but it's not enough to stop watching the show.
Overtime like any show you get attached to it and look forward to watching it, but this one gets special. They start to really put some more effort into the show and actually develop a universe with many lasting memorable characters and an actual timeline where everything is cohesive. Amazing and great twists and turns are expertly positioned in the show and it's quite sad to see it go. It comes to a smooth well-though out sigh-evoking end, with only a few minor wth moments. All in all a really solid show, definitely up there with some of the best cartoons of all time.