Renegades Invasions infinite supers for defenders?

Can someone let me in on the joke regarding invasions, please? All invasions noted here lasted less than 5 minutes, so barely time for even 1 super.

My first invasion against a warlock had him pop his super twice, easily defeating me with it, even after hitting him three times with the praxic blade... that seems... fine - seeing as the sword is a one hit kill, but whatever, after all, there's obviously a joke I'm missing.

The second against a titan, he decides to use twilight arsenal 4 times. no, I did mean it. 4 super uses. Again, hilarious. He even used it, missed me with all 3 axes, then when i popped out of cover to use mine, guess what? that's right, folks, he hit me with his super, again.

The third against a hunter who used storms edge three times. I dodged him every time, basically running for my life instead of actually being able to fight seeing as he was constantly a teleporting whirling blade, able to shoot me when out of his super as I was out of position because I had to be dodging constantly.

So, whilst being tactical and letting them use and miss supers against me, so that I can beat them with better gameplay, they can just simply wait a few seconds a use the super again?

Can someone help me out - what am I missing - or are infinite supers for defenders just a normal thing and basically invasions are a waste of time.

I'm all for the challenge, there are a million guardians better than me - I know that- but what's the point of this?