How did that happened? Why are all the other inhabitants mutants or monsters and Finn be the last human? ah ah I always tought the princess was human too (that's what i get from watching random episodes).

Is probably just a weird set up for the series. But i totally agree whith you about this being very adult themed... well, in its own way since it's on CN. Especially Marcelline episodes. There are some that just amaze me. And the dark romance possibility with the two. She's a vampire with 200 years (with a very twisted mind sometimes), he's a 13 years boy, with no experience with girls and a pure mind. Kind of a taboo here, but a very cute relationship. :p

It's not the setup of the show and it's never overt;y stated but there are clues littered through the series especially Ocean of Fear (there are ruined human cities) and Business Time where some lawyers/businessmen are defrosted there is also the episode Susan Strong where finn meets some mutent fish people.

And lots of stuff like this http://tvtropes.org/pmwiki/pmwiki.php/Radar/AdventureTime

South Park is by far my favorite.

I put South Park, although I love about half of these shows, especially Boondocks and Futurama.  If you had Venture Brothers on the list, I would have picked that, definitly the best "adult Cartoon" on TV.

Went with Futurama...it's so amusing. Phillip J. Fry...my hero.

I think you mean scatological layer. Eschatological means something quite different (though also an occasional part of South Park).

THE BOONDOCKS!!! Aqua Teen Hunger Force and Futurama are tied for second. Robot CHicken took a while, but it grew on me, so that's third. And I don't even watch Family Guy or The Simpsons anymore.

The Simpsons. The other ones are all meh.