Best:

-Team Player:

Someone who actually plays the objective.

-Healer:

Someone who gives health to their team mates when they ask for it.

-Supplier:

Someone who provides supplies such as ammo when requested to do so.

-Observer:

Someone who Scouts out and warns their fellow team mates of upcoming rival players infiltrating them.

-Road Clearer:

Most important job of a Sniper is to make a road path that's safe for other team players to move forward on.

-Capturer:

Somone who's main purpose is to capture objectives as requested by their team mates when their pinned down and can't reach it.

-Supporter:

Gives aided assisting to the team and makes sure any remaining rival players are terminated from the base.

etc.

Worst:

-Hacker:

Someone who intentionally cheats and ruins the game for everyone else.

-Camper:

Just hides and wants to get easy kills while avoiding team work.

-Lone Wolf:

Only plays to get high stats and refuses to work with others.

-Glitcher:

Someone who looks for exploits in any game to give themselves an unfair advantage against other players.

-Wonderer:

Someone who just wonders around and doesn't even try to play the game the correct way.

etc.