I don't care a bout a lot of announcers, but there is two broadcast teams I hate: Orioles and Yankees. Michael Kay is annoying, and the Orioles guys are biased idiots, besides that I really don't care. I like the Blue Jays announcers, I really enjoyed the Braves guy during that series and Astros guys were good as well.
I've also been watching a lot of west coast games when I get off work and Brandon Webb does a solid job doing D-Backs games, and of course Vin Scully is amazing.