I don't think Lewis did anything wrong today, both times the lead car turned in much earlier than they normally would, and far too late to defend the position. Maldonado you can put down to inexperience, but Massa has no excuse and his comments after the race lead me to believe it was a deliberate move and part of a strategy to rattle Hamilton. Just watch the replay of the hairpin pass, Massa jumps into the way when he sees the move coming, not out of it.
Personally I think Hamiltons only problem is overestimating the ability of the driver in front, he assumes they will all see the move and have the common sense to give up the corner as they should. What he should have realised is that Massa gets driving tips from his engineer, and needs the "idiot board" to tell him to brake during tyre changes, he is not an intelligent person, especially not on track.
Incase you're wondering I've lost all respect for Massa, I don't like drivers who can't race properly coming out and saying other people should get penalties "so they will learn".