the main thing about gearscore thats weird to me is that theres so many different ones. theres the addon then wow-heroes and be.imba are both different and im sure theres even more than that. as far as the 'gear score doesnt mean that the player is good' argument goes it is true to an extent, but if youre about to try a higher tier raid its nice to know that the tank that is trying to get in the group just straight up doesnt have the gear to do it no matter how good he is.

personally, though, i dont check gear score for anything but giving other guildies a hard time. we have fun with it just having an ongoing gear race. though i do know that as a holy pally some of the higher scored emblem gear will actually gimp me slightly.

thats why i take it with a grain of salt and just play with other nice people. i usually try and stay away from the raging nerds out there who smash their keyboard into their flatscreen cause we wiped on emalon once...

tl;dr if the guy gave you a hard time about your score then you dont want to be in his raid anyway cause he sucks.