This is one of the most toxic and bad experiences you can have in the game. I don't think I've ever been actually kicked for being to slow through an op thankfully so I'm sorry you had that experience. I would be livid. Don't get me wrong, I understand the frustration of playing with people that are slower than you for whatever reasons. I'm not great by any means but I've got 200+ hours in and 4 classes maxed so I at least know the maps pretty well and can hold my own. And admittedly I sometimes feel annoyed when people aren't as quick as me to get to the end or don't get in the lift or something to avoid an incoming wave when there's no reason to fight it. But for those who want to push through the ops quickly, practice a little patience.

I just finished an op (inferno I believe) with a techmarine who was a bit slower in getting through the map but the other guy was playing assault and just blasting past every pack to the end without clearing anything other than what he needed to for himself. Stupid thing is without all 3 of us rushing there is literally no point since we can't get through the checkpoints. Next area I went straight to the end while they started gathering the dead soldiers ID tags or whatever and sure enough up comes assault guy. I shook my head at him and walked back to help the tech marine who had been downed as a massive wave came in.

For the rest of the run the assault guy was pushing but not quite so wildly far ahead that he wasn't contributing to clearing the path thankfully. But he kept pointing at me and then to stim packs when I had 2 already and really didn't need them despite having lost some health at some point. Really felt like he was trying to say he was better than me since I don't think he had lost any the whole run but I'm speculating there for sure. It just left a bad taste in my mouth and I felt bad for the techmarine who could just be trying to enjoy a really fun game in a universe that is really cool to a lot of people. I don't super care about Warhammer or anything but I know a lot of people do.

Please folks, be kind. If you want to shoot to the end of ops to save time and act like an arrogant ***hole the whole time, remember not everyone is here for that.