The question I find myself asking, like others previously in the thread, "Am I a dick to people in the view of many people by being a 1337 sp34k1ng d1ckh34d" or "Do I enjoy playing a sneaky class like rogue in WoW, sniper in CoD style games or similar"
The answer to the first is an emphatic no, I want other people to be having fun as well as myself. The answer to the second is a "Hell yeah!" because if you can set up an ambush to wipe somebody from the face of the earth, it gives such a massive hit of a feeling of a job well done.
To use Smerf's example, I would totally shoot a guy who is reloading in game because that is efficient however, I wouldn't corpse camp that guy because that would be being a dick.
yeah, I know that it's hard to corpse camp with fixed spawns but you get my drift.