AW looks like they are taking care of the little things. (Like having the kill feed in bottom left)
I like your K/D idea. I think public matches would be more fun and enjoyable. But most of the people who truly care about their K/D play TDM anyways.
Hate to burst your bubble, but Sledgehammer Games co-founder Michael Condrey has confirmed that Demolition will not be a game mode on launch day.
Of everything else you listed, I agree with everything except the MW2 Spaz-12. I do want strong shotguns that can win their fair share of gunfights, but not as secondaries. If the rest of the shotguns in the game are as good as the one we've seen (Tac-19), I'm fine with them as primary weapons.