All the other criticism here were dead on (sagged in the middle). Only thing I would add is that it seems to me that the master of cinema that is Scorsese kind of missed out on the dozen other movies & tv shows of the past 15 years with the same twist. I didn't so much mind seeing it coming, but I would expect that Scorcese knows that we were going to see it coming and he could have play with the audience more regarding that expectation. For example, it would have been more of a surprise to the audience if it turned out that he wasn't crazy.

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"Play Your Game" (c) Stan Van Gundy