Shi Davidi knows his stuff and is pretty knowledgable. I'd say he's probably the best Sportsnet has. Mike Wilner isn't that bad, though sometimes can be a Blue Jays homer. Overall, he is pretty rational though. Again, he had to deal with idiots calling him every night after a Blue Jays loss, which I'm sure a lot of veteran posters on here would have vented against haha.
Zaun is watchable, though I don't take him seriously. Trying to be the Don Cherry of baseball. He provides some good insight on in-game stuff like certain plays etc, those his overall baseball analysis is lacking.