Ranked? I gotta be level 10? I just don't have the patience for this game.
It's a minor annoyance that the additional multiplayer modes are behind a level wall. Other games place create-a-class options and other things behind level walls, but it's rare for a game to have multiplayer modes behind levels.
That said, I find it to be a short time to reach Rank 10 in Splatoon. A good 5-7 hours of Turf War should be enough to reach it, probably less.