Yeah, I find it -greatly- helps having a good guild. We've just started Molten Core, after having fought our way through Zul Gurub first, and we're well-oiled enough that even with new bosses, we're plowing through them. Plus, as we're reassessing what people need (mainly, more defense for some of the tanks, and Fire Resistance for everyone), the whole guild is helping out -- I've had people donating defense stuff to me right out, and then when we got lucky on a Scholomance run and two of the newly upgraded Deathbone set pieces dropped, the Pally in the group didn't even hesitate before telling me to take them. I think Karma smiled on him, though, since the next night he got his Lightforge Chest while we were running through to get me the Draconian Defender. It's a pretty noticable difference when your Defense skill goes up 50+ points in two days, let me tell you.