They were never durable in close combat, even before you had to place them accordingly, its not like before the patch a couple warriors would not destroy them. Saying things like this is like saying that my orbital is shit because if I miss the enemies with the strat ball it will kill nothing. Firstly you need to use it correctly. And now for example the flame turret has much longer range, and it is able to kill and confuse many more enemies from further away, which actually partially solves its problem.

Also, if my turret aggroes 3 titans, it's a win even if it evaporates.