I'm not so bothered by the need to fire a follow up shot with a shotgun. It'd be nice to see a spread reduction, though, since a 10 yard headshot will net you roughly 6-12 damage as it is now.
I agree that conquest being one round sucks, on Metro tunnels, it is far easier to push towards A, IMO. You have the tracks, and now the one place folks go to be safe from the guys using the perspective advantage being on the tracks gives you, have to also watch for folks coming from the train car. Plus, the inevitable prone/slope abusers have all the slopes on their side. And since all you have to do is take and hold C to win, it seems it favors the team pushing from D.