To everybody who is "on the fence" about watching Adventure Time: Do yourself one of the possibly greatest favors of your life and watch the living heck out of it.
It really, really is that good.
It takes a little while - most of the episodes fall into either the "playful, carefree, enjoyable" or the "omg, adventure time has just explained life to me" category and the first two seasons are a little heavier on the former. Around season 3, the latter starts to take a firmer hold and it all culminates in the three episode switchover between season 4 and 5.
I'm still blown out of my mind just thinking about how incredible that three-parter is*. Don't skip to it, though. Like wanting to hike up a mountain to appreciate the height instead of taking a cable cab up to the top, you should watch every single episode before that. You won't regret it and if you have any feeling in your heart, you will be brutally ravaged by the genius that is Adventure Time when you reach the top.
I just opened up the wikipedia page to make sure my episode count is right. Just reading some of the episode titles gives me chills. And we're ten minute cartoons with silly toot jokes here.
Watching Adventure Time has made me a better human. Should I ever meet Pendelton Ward, he will get the most tearful and awkward man hug I can muster.
* And it comes after 'I Remember You'. **JEEEEEZ**.