I leveled a toon to 15 and threw down 20 bucks to try to understand the UN FUCKING BELIEVABLE complex currency system on this game.
I bought keys to unlock these purple chests that drop all the time. Ok so it's a great game. Seriously great game. But they sort of assume you're going to max your levels because they give you all kinds of gear and enchants that you can't use for months and months.
It's kind of a sad reality that the only way they can make a game this fun for free is to rope you in for the long haul and provide very little early and middle game content versus end game.
Once I unlock some more zones at 20 and 30 we'll see how those quests and instances flesh out the game.