Even if the X and Y axes were properly labeled, the order makes no sense. What does "properly enjoy" mean, anyway? If it means "master," then fighting games should be on top by a large margin (of the categories listed). But of course you don't have to master a fighting game to enjoy it, and in fact they can be enjoyed with pretty minimal time investment if you're just messing around with friends. What action/adventure games are taking more time to get through the tutorial than it takes to memorize the entire movelist of the average fighting game? What FPS games that the bro stereotype pictured would be playing require more time to grasp than the mechanics of the average platformer or puzzle game?
I renounce this chart. Back to the pit with it.