Clarence and Steven Universe are awesome . Gumball and Regular Show are good. Adventure Time is ok.
Gravity Falls still trumps these though.
Atomic Betty wasn't Cancelled they reached the final episode and ended it
as for why it's no longer on the site, that I can't answer
Cartoon network has just been one huge mistake for a while now. The last good show they have is Adventure Time.
That was for Canada (where the show came from). I'm asking why did they stopped airing it in the US from 2006 and later.