Mastery:
Camping means you are not fast enough to attack.
Spamming means you are not good enough to predict.
Running means you are not good enough to fight.
Spawnfragging is an opportunity, not a way to win.
Shotgun means you are not precise enough to Rail.
BFGjumping means you are not fast enough to hunt.

Giving up means doing neither, training means doing what you are not capable of, trying to win means using everything you can.