With the removal of stuns, Sombra now has permanent get-out-of-jail-free card.
With the short cooldown on teleport, she can constantly flank from behind to target enemies but if the enemy is a better player, instead of being punished by the better player, Sombra can just teleport out at the last minute with zero consequences.
Either, Sombra should only be able to teleport after not taking damage for 1 second or have a cast time of 1 second before activating. If 1 second is too long, somewhere between 0.5 - 1 second.
She needs to be punished for losing a fight and not be able to bail to a health pack and immediately go back to finish them off of an otherwise lost 1v1. As the receiving end of winning the fight but losing the battle, this is very frustrating that she cannot be punished.
Her damage is fine. Hacking from stealth is a great rework and fits the character more. She just needs to lose her get-out-of-jail-free card.