Can't comment on the streaming quality as I've only watched TV coverage. That said, SBS coverage has also been fine for me on TV.
Commentary doesn't really worry me as I can see what's happening and just mentally tune them into background most of the time. Exceptions are when someone says something particularly dumb or particularly insightful.
On that front, I think Gaze is doing better this year, since his coaching stint with the Kings. On thegames of his I've seen, he's given more interesting tactical observations in his commentary and less hyperbole. I liked Jenni Screen on whatever game I heard her on at the weekend. Also added more value for me than she subtracted. Beyond that, I don't recall anyone else saying anything that added real value to what I could see for myself on the TV.