I think the real 'brilliance' of The Lego Movie was how they used a real, well known toy property to explore the notion of creativity in a pretty expansive way.
On the other hand while I don't see it that way myself, I can understand that someone would find it overated.
Personally I'd say Gravity Falls.
Like it's great and well executed but I don't find much new.
It's like they do what all the great nostalgic shows or films have done before and they do it really well. But there isn't an angle in there I haven't seen before in a show, except maybe the cryptology.