-1 for topic
+1 for almost all answers
i`d like to add one more point:
the in battle behaviour is like an advertisement for/against the fleet you represent.
new players should be able to see how the majority of each fleet acts to decide which one will get his app.
not shooting the fleetmates, like certain fleets/players are known for is just lame and stupid.
I prefer to fight my fleetmates because its challenging and helps the team like nitecreeper said.
And there are fleet-tags that look like cross hairs for me. i really enjoy destroying their chance for xp any time i can.
I very much use fleet-tag and nickname information to decide how im going to fight them. There are players that i rush immediately and there are players that i admire for their competence and therefore attack them thoughtfully or even just defend.