WoW's various incentives for not playing too long in one sitting make sense; punishing me for playing a WHOPPING 15 minutes is just plain stupid, practically enough to make me quit altogether.
Only complaint: the combination of the fact that you can pause/build blocks and that you can sell/buy blocks at the same price makes it too easy. You can literally reinvent your strategy to suit every second of game-time. I got every golden drop my first time through without a problem. Although, the fact that I played all the way through is telling of how small a complaint this is, though.