Not many coming through nowadays at my current gig fortunately, at least not that I understand! It's kind of part of my job to help people do it better so I'd see it as a failure on my part. I help hire most everyone that does back end work, I like to hire people as clever or cleverer than myself (I hope my experience counts for something), so they take hints really quickly, and generally I'm learning from them. It's a nice situation to be in for sure.