Chadwick Boseman is terrific, but <em>'Get on Up'</em> is missing something that would make it a great biopic. I still very much enjoyed it, I always tend to find biographical films interesting - especially when I don't know too much about the person(s) in question, as is the case with James Brown here; I've always known of him and his major songs, but that's about it. Boseman leads strongly, carrying the film really. That's not to say he's alone in terms of the onscreen talent, as there are others who I liked. Dan Aykroyd is solid, while Octavia Spencer and Viola Davis are welcomed cast…