Just because you don't know how to use tactics doesn't mean nobody else does.
Quite the contrary.
I usually play sniper, and there are several things I don't do.
For one, I've never set foot on the battlements, ever. I either control the lower base or the sewers.
I don't use the Huntsman, that's for offense.
There are times where I will cover offenses by giving covering fire, and other times where I'll hold the enemy off when they try to uber and destroy one of our bases.
There is a difference between using your weapons tactically and swapping them just so you can get revenge/kill someone.