I don't really know. You can discuss the various performances in acting in Star Wars for a long time (typically, a few performances have been less than stellar, to say the least, anyway), but what is true is that acting awards often go to a very different type of film anyway. Lord of the Rings, for all the success it had, none of the actors got any recognition whatsoever (at the major awards, at least). Even actors who do win it often end up doing so for relatively obscure films compared to their more famous/ successful output.
Supposing baz's assertion that black actors would have made Star Wars tank to be true, what I would like to know is why he thinks so. Is it because Black actors are rubbish? Or because audiences are racist? One way or another, if it's true then there is a problem. And if it's false (and, indeed, the evidence suggests that he's talking rubbish), then that it's even considered a reasonable suggestion is also a problem.