I love him. His breakthrough directorial achievement was Caryl Churchill's Cloud 9 Off Broadway the year before he did Nine on Broadway.
He had already done The Club Off Broadway, which was a brilliant feminist take on men's clubs, with all the mustachioed men played by actresses. And then he did Day in Hollywood/Night in the Ukraine, which was pure entertainment, superbly done.
But I suppose that those who know him only from Will Rogers and Grand Hotel don't think of him as quite such a genius.
But after Michael Bennett and Bob Fosse died, many of us kept thought he would pick up their mantles and do ever more brilliant work. Sadly that never quite happened.
Of course, it still could...