Have to agree that limiting control spells to 2 rounds is kind of crap. It doesn't come up all that often as combats are pretty quick. But when it does, it sucks. However, i will say sleep is certainly not worthless. It has the 2 turn limit but it has been massively buffed from base 5e. They removed the randomness from the spell by just having it be the full dice roll and they also let you select targets instead of it going lowest HP to highest HP order.
