More detail on the Obi-Wan/Anakin's mother thing might have been nice. We know that he knew (talking with Anakin about his mother in the lift up to the chambers in AOTC), and we also know that he specifically said to the Council in AOTC that it was getting difficult and dangerous with Anakin and that they should do something, in which he was ignored, again on Chosen One grounds. I think, therefore, it is unfair to see him as totally irresponsible in that respect, but I do agree that we should have seen more of that.
Qui-Gon was, of course, right. As GL puts it, he made a very dangerous decision but he was ultimately right. Part of the tragedy of the SW story is that if QGJ had lived it probably would all have been fine. It was that Obi-Wan, who was not as good a teacher as QGJ or Yoda, was trapped by his final promise to QGJ to do that work that the whole thing started to unravel.
"Qui gon should have known that the attachment to his mother would pose a serious future problem for him"
Again, to be fair on both the film and QGJ, Obi-Wan actively says that to him, and QGJ refutes it in his own style- saying Anakin's future was uncertain, not DEFINITELY dangerous. QGJ was taking a risk and he knew it. As I say, the ultimate tragedy was that he died.