In regards to not liking anything past Sealab and Aqua Teen. I loved both of those shows, but I don't think they hold up when compared to The Venture Bros. The Venture Bros is well written and doesn't just rely on crazy antics to be funny. It's character driven and gets funnier and funnier as you learn the characters. That being said it also has some great crazy antics and some awesomely hilarious jokes and fight scenes. Personally as a huge comics and cartoon nerd The Bros appeal to me especially for all the references to old cartoons and comics.
And not to get too technical, but Aqua Teen and Sealab are kind of Second Generation compared to Space Ghost, Ghost Planet, and Brak show. The stuff Adult Swim is making now is 4th or 5th generation at the very least. It's been around a while now.