The game is fun, but the wait times are completely unacceptable.
Considering the vast resources at Riot's disposal, there should be no reason that this company doesn't have enough server space to support this new game mode. At the least they should have created more before launch, to provide their players with a stable and enjoyable environment for team fight tactics.
I enjoy the game, but waiting a guaranteed 15 minutes every.. single.. time is a huge turn off and honestly makes me angry as a customer.
EDIT: As this post was made earlier, yes, I have also waited 1hour and 30 minutes for my last que. Which is also extremely unacceptable, far more so....