I agree with Garrett but with a slight change.
I think 5 is the best for quality news delievered with quality.
7 should change its calls to W"PAP" Paparazzi. They have so much tabloid news and they blow stories way out of proportion. I can't remember a specific example off the top of my head, but I'm sure others can. Its like a story on how a rock in a tire caused an accident and they'll say "Coming up on 7, What will cause you to smash into the pavement at 100 mph and what can the governement do to clean these little annoyances up! Find out next on 7!" and you see the story and you feel like you've been lied to lol. Some people like this brand of news reporting, I, for one, don't.
56 I think does a good job connecting with older viewers on the 10 O'Clock News.
25 nails the younger demo but sometimes can have that paparazzi feeling to it too.
4 is pathetic at the moment. WBZ 4 First @ 4 in years past was much better... they don't even have a 4pm newscast. This rubs off on 38's broadcast, though Chris May does well for himself.