I think they're incredibly boring gameplay-wise and strategy-wise.
I see the notification pop up, I pause, I go to the planet, I build 10-20 engineers, then the defensive structures, then I pull back my fleets from any missions and wait for the wormhole to disappear, 99% of the time the wormhole waves are instagibbed by the stack of ambush turrets and no fleet intervention is required.
Giving the player the ability to disable them completely would be a good bandaid, but I see zero reasons to ever have them enabled in the current state: there is no way to plan long term around them, unlike all similar long range waves in the first game, you can only react to an RNG roll.