Well, when you think of the fact that a tier item gives you what.. like 400 more HP, maybe allows you to do 30 more DPS, or heal for like 100 more HP.. i mean, wtf - at that level better gear doesn't have an insane impact. There is a difference though between generic level 70 gear, from Karazhan, and gear required for Black Temple, though, im sure. But skill of players can make up for lack of gear. I'm horribly geared, but I'm one of the best healers in our guild, and I have played for like 1/4th of the time these dudes have.