I had a guildy, not a bright cookie. I have several stories about him, but this one is relevant to this thread.
He told us that he had tanked before, and was interested in taking one of our MT positions. Since my schedule demanded that I raid only 1/2 the week, the other half of the week was wide open. He came to us, for kara, with this spec;
0/0/61. He was the kind of player that had to be told 'exactly' how to do things, and how to spec.
I gave him a cookie cutter build to use and some G for a respec. But a few months later he respecced again, to a very very similarly bad build.
3/17/41. I had to again take him aside and tell him. NO! bad player!