If they are part of the same guild I've never had a problem. But some random? Pass. It isn't my job to carry someone who hasn't earned their gear yet. It's their guilds job to help them get geared and progress.
And as for pvp if they are in pve greens like my example they not only are under geared but inexperienced as well. Once more it isn't my job to hold some randoms hand and help them through content. Join a guild or work with others of the same gear level to progress
It's no different than someone who is in little league trying out for the majors. Or for a peewee football player trying to be on the starting lineup for the colts.
A week link brings the entire group down period.
I look at gear as the only measure available at a glance to determine if someone should be running with my group. Sort of like a resume.
Do I miss some great players. Sure. Do I miss a lot more baddies. Definitely.