As a guy recently removed from the left seat at a regional, I can tell you that I noticed a marked decline in the quality of pilots occupying the right seat over the last 5 years. There were quite a few military guys just treading water, getting some 121 stink on 'em and waiting for the big boys to call. The vast, overwhelming majority were great to fly with. But there were a few who, after flying C-17s to every backwater on earth (respect!) or flying AC-130 gunships in the dark over Afghanistan (mad respect!) seemed to view the whole RJ thing as beneath them or seemed to chafe under the whole airline seniority thing. And of the civvies coming up, most were good too. In both groups however, there were more than a few that ran the gambit from requiring a little extra "mentoring" all the way up to just shake your head and mumble to yourself or the FA "What is this guy's DEAL!? Is it day four yet?!"

However, that could just be my slow transition to being an "old guy" showing.