Convoluted - as in, I can't find a major theme so far. I'm having trouble recognizing major characters vs. minor characters... etc...

Anyway, seeing as GF I, II and III did a fine job of identifying main and minor characters (and treating them as such) I don't see how introducing 'new' major characters enhances the plot/story. Of course, if you touch upon the Vincent regime, then yes, new characters are indeed necessary. Again, we don't need everyone to know everyone else - having second-tier characters from Parts I and II with nifty almost too-neat tie-in's to Vito's past just doesn't jive with me. FFC gave us enough backstory in the Sicily flashbacks, why add anything to that?

I talk too much...