Chowder was okay. I stopped liking it after the first season though. Used to say "Rada Rada" in High School in front of my friends for a long while.
Flapjack was just down right creepy IMO. Wasn't terrible, the writing was okay, but it was still just downright creepy.
Ben 10 was also okay, but man have they completely milked it. I tried to watch the first few episodes of the first spin-off, but I couldn't follow the plot at all.
I won't watch Adventure Time or Regular Show willingly unless nothing else is on, but from what I have seen they're both good shows.
I don't hate Teen Titan's Go! just yet, but I am definitely in the boat that it's not even as close to being as good as the original show. Needs to be slightly more serious (especially with Robin) and be a more abridged take on DC comics rather than random plots.