Gear score is, thankfully, something I don't see as a requirement much when I see people forming pugs on my server. Horde side on Garona seems to be real kind about this, but as we have such a low player population, we just get-by with what we have. I don't pug much since my guild, although small, is very active with 10-mans and 5-mans.
The alliance side on Garona, however, is a different story from what I've seen. There they do ask for your gear score for heroics like violet hold or halls of lightening, which I find pretty unfortunate. What really makes it a pain is that players that have to put up with that will oftentimes do pvp to get some epics of a certain item level just so they look better on a gear score. These players are probably perfectly competent at their class in mostly blue pve gear and could easily do the run anyway, but they aren't permitted to go because of what they're wearing. Seems like an awful thing to put up with to me. You can't get gear unless you go on raids/heroics, but you can't go because you don't have the right gear. It strikes me as completely unreasonable.
Obviously just my two cents about it, but I can't imagine I'm the only one who feels that way.