Generally speaking, there will always be some bias if you're commentating for the side you used to play for; at best it might be superior knowledge of home players/ lack of knowledge of OS players, at worst its overt cheerleading for the home team.
I think CW, because of the nature of the site, is pretty astute at sorting **** from shinola when it comes to commentary, but we are also collectively pretty fussy about it.
I have to say though, I've not seen so much overt general public hostility towards the channel nine commentary team as I have in the past 12 months. People are really expressing how ****ty they are very openly via FB, Twitter, on radio etc. I mean, if Bill Lawry of all people is pulling someone up for bias....
There's no doubt in my mind the cheerleading and dumbing down is largely a directive from management, but how much of it comes from complacency on the comms part and longevity? I recall when Healy and Slater first went into the commentary box, and tbh they were ****ing excellent. They knew their OS contemporaries and had interesting views on them, Healy's analysis of keeping and of IDing weaknesses in batsmen was amazing; Slater called it as he saw it and his nervousness actually worked for him because he took his time to get things right before popping off at the mouth. Likewise, when you hear Mark Nicholas analyse a batsman during a ODD game, he's superb - the bloke clearly knows his ****. Yet come the first international game of the year and it's all rah rah. ****ing annoying. And they've all been there ages now - they're in a secure job. I think there's a bit of laziness creeps in.
Everyone has their biases. Generally the biases of the commentators annoy you more when they are biases in favour of the team your side is playing against. But the current lot are the pits.
I've always loved Bill Lawry - just his sheer enthusiasm for the game shines through even after years of commentary. And he's biased - massively so. But he's also not afraid to call it as he sees it. I flat out nearly shed a tear yesterday when I heard him say of Marsh "There he goes; he breaks the shackles". Just vintage stuff. You won't remember many of the current lot for their signature lines, will you?
/rant