Well the call for the fake punt with Jones passing was a very good play. But a terrible pass, however, if Jones had missed the throw every time in practice, I seriously doubt they'd have tried it.
However, in Dallas' SB win over Denver, the halfback pass by Newhouse was a perfect pass. But he said they had tried it in practice several times, and never completed it. But they still tried it.
Wasn't a difficult pass, I think Jones got so excited seeing the play was working that he just overthrew to ball into the ground. I saw the same type of throw many times when my sons played youth football, there were few passes thrown by quarterbacks, when they got the opportunity to make a throw it was very often a throw into the ground, didn't let go of the ball soon enough, hence the downward trajectory. So I have no problem with the call, in fact I'm glad to see it, Landry did "trick" plays on occasion, it keeps defenses guessing...