The problem may be that the movie isn't nearly tough enough. It needs to be more hard-boiled, more merciless in its dissection of egos, more perceptive about the cutthroat nature of show business.

...appealing subject matter that’s employed to initially promising yet ultimately underwhelming effect...

Tom Hanks gets a job so brilliant, so ambivalent, that it's hard to know whether to laugh, cry, or watch him dance beneath the rain. [Full review in Spanish]

As someone who prefers her comedy with a side of melancholy, I'd say that the performance from Tom Hanks alone makes this a worthwhile watch.