What about finish solo ?

Have a smart behavior by finishing the campaign and the solo mode before coming on versus, you are annoying people who did it.

You finished the solo/campaign mode and you are still lacking of skill in game ?
Do more campaign/solo.

You still sux on infected side ? Use training maps.

This is to help you, by knowing what you have done.
This is to help me, by avoiding childs & ♥♥♥♥♥♥♥ in game.
Thank you.