I hear ya I had a couple bad ones myself after joining a group on lfg (one guy using a shotgun on Oryx, said he had no sniper then busting out Titan hammers) I immediately left.

Bro. Dead ass, the very first time oryx challenge came out, I got this guy off the forums to run bubble. Once he got in, he insisted he throw hammers and kill ogres with the raid fusion because 'it wrecks shit' LOL.