I felt like the rocks in A (where B used to be?) Really cut down the defensive possibility of RED because they cut out a majority of the pre-existing killing ground. The rocks also felt MASSIVE, and almost intimidating as a player

I liked whatever you did to B (previously A?) and it felt a little harder, even though I found some dominating sightlines. Perhaps if you added some small rocks for cover it could help these sightlines.
C felt much MUCH better, but still had the same 'massive rock' syndrome that A had. Vander makes a good point about the sightlines being cut up, but I found a few good ones as long as you were daring enough. Perhaps raising the ground near spawn could help a lot with these (the ground that you immediately walk out on to).
Finally, there is an amazing sightline that, as a rifle sniper, you can destroy people on Cap A with. Basically, if I position myself correctly in the zigzag tunnel between A and B I can get a great view right up to the top of the cap, and I could even snipe an engy (I think it was Nerdboy

) who was working behind the point.