From what I get on Extra Innings when I've had it - you basically have announcers who are either too "Serious", which is a bit much for a hometown broadcast, and homers who are annoying and do not offer any real analysis. Living here in DC, FP Santangelo is an annoying homer, and on Orioles broadcasts Gary Thorne has evolved into one.
Don and Jerry strike the right balance - where they clearly want the Sox to win, but are not going to sugarcoat things, nor credit the opponent when appropriate. Some games the analysis is heavier than others - but some games inspire that more. Don will not be out of work long. Sean and Jerry, Ned, Ken Coleman, Dick Stockton and beyond much can be said similar. Red Sox have largely been blessed in this area.