The NHL has always had a bit of a problem finding real personality, so I welcome Ovechkin's theatrics. Guys like him embrace the entertainment side of sports, and that is the only way that the NHL can compete with Football and Basketball in the US.
On the other hand, I don't want the NHL to become the NBA or NFL, with players more concerned about egos and personal stats. Ovechkin isn't like that at all, he is good natured in his showboating, so I really don't see the problem here. He's not acting lke this after every goal, 50 is something special and he treated it as such.