Yeah, C was sorta hard to cap, the sentry on top covers too much. It's hard to get a proper shot on it from most of the exits.
I'm also thinking the teams seemed a little too spread out when attacking C. It was hard to find my teammates to form a group.
EDIT: A and B seem solid, I think, although I didn't get to play on B this time, so that's from my memory of the last time I played.