This is a game that many people have more skill in by default. A lot of cultures have Mahjong in some form in their history, and many players have played it long before XIV attempted to add it into the game. You can already tell this on day one when people have gotten up to the 5th rank or higher (Lower numbers for higher ranks), and when you're stuck against just those people what's actually to keep someone playing?
First and second place get rewarded in this. Third and fourth get points taken away, with fourth getting the heaviest loss.
Why can we ONLY do anything ranked against players, and not attempt anything ranked with NPCs, like how we can in LoV and TT? NPCs have their own skill levels. They have NPCs with their own skill levels too, but in those matches you HAVE to play against 3 NPCs. Can't have any mix besides a 1-3 PC/NPC or a 4-0 PC/NPC ratio.
It'd be better if they could let us rank up somewhat from NPCs and just give people a cut off point score/ranking wise. But nope, the game will soon be populated by only people who know almost all of the ins and outs of the game.