There is some confusion as to whether/how the Dungeon Finder matches characters according to internal gear score. To the best of my knowledge, it actually attempt to create a discrepancy between characters' gear, so that you're likely to wind up with a few heavily geared members 'carrying' lesser-geared members. This is directly contrary to a claim I've seen circulating that the system attempts to match internal gear scores.
If the system doesn't attempt to create disparate groups, it should, and if it does, I'm glad it does. It may be disheartening to see someone in your group in full blues or maybe even a couple greens, instead of the now-familiar suit o' purples, but as some commenters pointed out in my post on Dungeon Finder bingo, we all started out in blues and greens at 80 (with the possible exception of some crafted gear and BoEs), and heroics were designed to be run with that gear. Where are the epics supposed to come from, for a pre-raid character?
Furthermore, a less-geared character might actually need some of the gear that drops in the ilvl 200 heroics (i.e. everything except CC, FoS, PoS, and HoR), which is a nice change of pace from the usual shardfest. It may take you a few extra minutes to farm your emblems, but PuGs are about more than just you: they're about a group of people coming together to help each other out, and enjoy a dungeon.