Hey man, sorry for being that negative during the imp. When i get slaughtered over and over, i get more emotional about it than i probably should. Combine that with the fact that i'm a worse player than a lot of the players during the imp, and there's a dangerous brew where i might say things that go over the top in retrospect.
I'll try to be more constructive.
1. As an attacker, the first point is really, really taxing. There are so many ways for the defenders to set up that it is kinda impossible to know where they will be. Pushing the cart forward doesn't really help because the first control point is so far away that the defenders are able to fall back and set up a second line of defense without giving up A, from which they are eventually able to recover because the distance eliminates the advantage BLU has by spawning there.
I eventually completely stopped going along the rails, went around and attacked the back of the RED players getting out of spawn because that was the only way for me to feel like i was helping.
2. The bushes on the ground, especially the one in front of the left BLU spawn exit and on the path down left from the cart completely hide minisentries and are big enough to make me not know exactly where it is to shoot it.
3. The path from C to D seems to have much of the same problems i described in 1, although i wasn't able to play it very much. At all times i felt that the layout rewards pushing the attackers way back as a defender, because as soon as the attackers get past the first fence, there could (and there were) ambushes in more directions than i was able to process (as said before, that might be because i'm a pretty average player.) The only path that felt like a flanking option is the dangerous one where you might fight a surprise train.
4. While i like that the "sniper roof" on C got clipped, it's not really obvious that it is visually because it's about the same height or even lower than B. I took fall damage more than once while trying to jump on top of it.
5. I got really big frame drops on BLUs first spawn, both when exiting through the door where the train passes and the middle door, which is unusual for my system. I didn't encounter big frame drops anywhere else.