I don't watch baseball that much these days, but I saw a game Joe Morgan was doing on ESPN this Spring. I didn't catch any bias from Morgan. He seemed to discuss the players in a neutral manner. Any PC statement he might have made is no worse than what you would get from practically any white announcer.
One thing about Joe Morgan that once occured to me is, that he is "easy on the ears." He has a pleasant voice that you can listen to for an entire game. In this, Morgan was a 100% contrast to O.J. Simpson, who was a failure as an announcer. Simpson, as Don once remarked on the Forum, was one of the most "white friendly" famous black athletes, before he commited double murder ( a civil court found him liable by the evidence). O.J. Simpson was, to me, hard to listen to. He wasn't bad in a 20-second spot, but his grating voice wasn't good for several hours, not least because of his poor diction.