Everyone points to the guys who killed Yogg in blues, but keep in mind it was mostly 200 level blues enchanted etc and far more key - they wiped a TON. Like 20 times. They did it and that's very impressive, but they pretty much had to execute PERFECTLY. That's all fine if you want to do that, but a lot of us aren't out to stress ourselves about doing 1% more DPS - 4500 is OK, 4545 won't usually matter. Yes, it will on 1% wipes and cutting edge stuff... but we're not all doing that.

"So, the very first thing you should do after every encounter, even if it was a kill, is say: "Great! Now, how can I improve?" When you can't come up with an answer, that's when there's a problem."

Depends how serious you are. I take the game seriously in the sense that I want to do well and help the raid suceed so I gear up, grab badge stuff, epic gems, learn my class... but you know what? When we down a new boss we enjoy that fact, we don't immediately go "nice. Now what can we do better?" Oh, we'll look over the WOL logs and see if there's stuff that could have gone better the next day, esp if it's a sloppy kill or whatever, but dammit... it IS a game.