As pcgamer wrote about when the tried the ut beta before cross platform was removed, there nothing the programmers can do to prevent the kb/mouse users from slaughtering those on a controller.
Whilst I wholeheartedly agree with this statement, surely they could create some sort of segregation such as Console-only and PC-only servers in addition to mixed platform servers.]
Those console players who get whooped repeatedly on a mixed server could play on a console server and the PC gamers can't complain too much either as they have the service they need.
If I was a console player, I'd personally love to cut my teeth on a PC gamer in an FPS match purely to test my skills and improve them.
And ever since FFXI, I have always wanted a game that console players could play alongside me. Something that did not require twitch reflexes or one where a certain input system had clear superiority over the other.