I actually have no problem with timegated Exotic quests. It actually adds something to the game for me and gives me something to look forward to in the weeks to come. If all of the Exotics were available every single day then, knowing myself, I would grind them out back-to-back-to-back and they wouldn't really mean much. Now I can look forward to completing a new quest line in another couple of weeks. Waiting for Lost to Light to pop up again so I can get another Black Spindle and a chance for that elusive Vienna Singer ship.