I think it might be time for more experienced players to reconsider running with new, extremely casual, or just plain bad players of the World of Warcraft. As a disclaimer I am not the most "hardcore uber-leet roflstomper" who has ever waved his e-peen around. I don't raid because I find it boring to run the same dungeon for more than an hour. I have been on a few raids before and performed just fine, but it's not really my cup of tea. Because of this I run a ton of heroics, and try to gear out my character the best that I can in that manner. I decided to heal a random reg last night to get the last two badges I needed for a new piece of badge gear. I joined a group to run Halls of Lightning, with a DK tank, an Spriest, Hunter, and Rogue. All of the players were 78-80, and all but the spriest had issues. The spriest was fine level 78 and tapping the charts at 1.3k which is fine maybe even really good (I've never played one) for someone of his/her level. The tank was earnest and fun, but didn't know the instance and struggled holding aggro in groups. The rogue had a hard time pushing 800 dps, but otherwise not a problem. The hunter was from a different planet entirely, no pet, stood in melee range attemping to fire, volleyed on every pull,trapped seemingly at random, and pulled about 500 dps.
I loved it. It took way longer than it normally does to blow through the instance, whiped once, and struggled on things I haven't struggled on in a long time. It was challenging, exciting, and a bit humorous, it is a great break from the faceroll monotony that most of the runs I am on have become. Before you bail early on your next group of "bads" what I am saying, is give "newbs" a chance.