I prefer to play the odds, and a person with a 5k GS is much more LIKELY to be able to out-dps a person with a 4k gearscore. Of course there's no accounting for taste, but there is no way to tell who the better players are unless you know them, and that's why you always fiull a raid with friends and guildies first, and PuG the last spots with people from their GS.

If your GS isn't up to par, pad it with PvP gear, it is hella easy to get and way over budgeted on GS. A full DEADLY set is 4400 GS.. which is enough to get you into any raid on our server, except maybe ToGC.