I wouldn't say Sterling was an unbiased commentator... for example, he wrote a very Parramatta centric criticism of Michael Ennis for Fox Sports after Ennis' bust up with Hindmarsh about players standings in the game and how sledging is fine but there are rules and that Ennis isn't/shouldn't held in the same high regard as Hindmarsh etc... it was just petty rubbish to protect that shaggy dog sook
that said, I think he is actually a very good commentator... he has good insight into the game... he is clearly intelligent... he can be witty --> eg. during a Knights game I think, Ben Kennedy was coming off with an injury and Gus commented that "the Ben Kennedys are not meant long for this world" because Kennedy played so tough and Sterling responded "that must one hell of a cork then!"
importantly, he is better than pretty much every other ex-player they have brought to commentate --> Fatty, Steve Roach, Paul Harragon, Fittler, A. Johns etc.