5 kills, flag capture points ... 4,400 credits ... ??

Tanitha: A breakdown of exp earned after the game would help stop the confusion and help stop a ton of posts like this. Until then sometimes we are are left wondering.
It seems low, but kills don't earn very much at all, damage done does.
And capping earns very very little too.
Damage done, depends on their level compared to yours..
So really, What was the level difference between you and the tanks you killed. And how much damage did you do? Shooting tanks that are on 5% health pays you little.
But yes I agree, on face value, the credits earned do seem very low.