Big Fish **1/2
                        By: David ShewardNorbert Leo Butz, Zachary Unger, Sarah Strimmel, and castBig Fish is an example of what I like to call benefit-of-the-doubt shows. These contain problems with the structure and storyline, but often have enough pizzazz and heart to merit a critical pass. In Big Fish's case, the episodic, underdeveloped boo…