For many, it's the first game that does battle royale right, without any zombies or other bullshit. It may look like a game from 2010, and have a lot of jankyness, but the gameplay loop is just so addicting. In contrast to dota or csgo, the game is very accessible for new players ( got fourth place in my first match) and is easy to pick up and play for short bursts of fun, one match at a time. Also, the game is not a fad, it's here to stay. Mark my words.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.