They've been able to really capture the attention of their audience with the simple message, "You're not you when you're hungry. Eat a Snickers."
They're telling a relatable store; each of us has experienced the mood swings that come with hunger, but they approach it in a unique and humorous way that makes the message stick. They don't sell themselves as a healthy snack or something they're not, they make it clear that Snickers is the fastest way to solve your hunger and get back to normal. It definitely appeals to the "fast food" mentality that so many people hold nowadays.
As a medium, having a commercial in the SuperBowl is like winning the advertising jackpot (if executed properly). It's a community event, people gather together to watch the game, but mostly, to watch the ads and actively discuss the ones they like and don't like. You can google "Best and worst superbowl ads" right now and find 15 different articles on the topic. "Visual, visceral, and emotional"--I'd say Snickers nailed it this year.