A little late on this one but I just finished Gravity Falls. Loved it. A clever, fun all ages show that is perfectly self contained in 2 seasons. No filler, no pandering or dumbing down, no embarrassing lazy pop culture references or gags and no shoehorned in creator or network agenda. It looks good too, not amazing but they definitely put a lot of thought and effort into everything. This is up there with Home Movies, Mission Hill and the better seasons of Regular Show for me, it's really a gem.
A show like this makes all these new "adult" cartoons on streaming look absolutely pathetic. A conveyor belt of dumb, lazy, ugly, pandering junk just being cranked out and rightly forgotten.