I understand the point that old characters had more expressive designs but i honestly think that animated shows nowadays have good design for characters.
People keep forgetting that "the good old days" of animation had a bunch of characters who looked exactly the same. And all that calarts argument aside,i dont think Lincoln loud looks like Steven,or steven looks like gumball,or gumball looks like clarence.
Thats not to say there arent ugly cartoon designs too,but theres more good than bad.
WOY is a great example of how those old type of characters can still shine in modern times.