This is my thought process when making a pug :
If they have LFR Gear with decent gems / enchants with no current raid experience, but they have 20+ kills of last teir, I will happily bring them, it shows they have raided properly before.
If they have no raid experience but it is an alt with good gems/enchants and they tell me the name of their main, ill do a quick double check on armory, make sure they have atleast raided before, and I am happy to bring them.
If they have LFR gear with no experience at all then I will not bring them. Or if they say 'o yeh my main is on a different server and i cant remember his name' then i tell them where to go.