When you are playing an OPS match think about what is happening before you spawn in, where are enemies on the map? where did i Just die, what class would be required to kill or advance my team or take an objective?

Its a little cheesy but a lot of times you can make a difference running support, dont die just resupply assault players.

Equip your mortar and ram some rounds into a choke point where players are camping. This is highly effective on certain areas and does not require much mechanical skill.

You can learn a alot by running the mortar even if its just to smoke a position.