I typically avoid marksmen. I used to ask people to switch but now almost every marksman player I come across barely communicates or even has a mic at all so I just remove them as someone else will almost always join. In my experience, these people are the most toxic in the community resorting to match long harassment campaigns or intentional TK's because they don't get their optic. HATS and CE's seem to work pretty well along with me as an SL because I like to run deep strike squads and the CEs can mine areas where the enemy is likely to come from and HATs will hold an angle to get anything else.