It is known that high ping players can cause issues for the rest of the people on a server and it's also known that sometimes high ping players can actually have an advantage as well.
It is more complicated than that - a 200+ms player will often cause the quality of the experience to be a bit worse for everyone but it seems to impact some people a lot more than it effects most. For instance I can play with the same group of people and have an almost perfect experience and then a certain player will join and everyone else is fine but my game will act like I'm at a 0.5 second disadvantage in firefights and I can quickly slide from top of the scoreboard to bottom - if that player leaves I'll easily climb back to the top. Unfortunately around 1/3rd of players seem to trigger that effect with it worse if they have higher latency so avoiding it is difficult and it happens most of the time.
It will go from me being able to sneak up behind players and drop them easily with a quick accurate burst to them having loads of time to turn around alerted by the damage and kill me first despite me having a big advantage on them while almost no one else is effected to that degree - though I see the odd 1-2 other players complain of it on the forums so it isn't just me exclusively.