My issue with comp maps is that, at least from my perspective, all formulaic and similar. Very minimal variance in gameplay, and not much is explored in what could be 'fun.' Bridge-like mid (or granary), spire-like 2nd, rectangular finale with raised sides. Look at the top 3-4 5CP maps on the workshop right now (Glassworks, Sunshine, Metalworks ... Sorry Crash). They're competitive, and they all do that. Look at custom maps that are official, Gullywash, Process, same thing.
Yes, it's a good thing because they play well, but it's bad because it's virtually the same type of gameplay over and over, just a different skin and some changes here and there.
I do fully understand WHY this is though, and I do not disagree with the logic as why it's happening. Though, as someone who wants to actually see new stuff, innovation and pushing the limits of mapping, it's very frustrating.
Now, I'm sure that a competitive player will come in and tell me how wrong I am, but this is how I see it, and what I understand of it with my experience in the competitive scene.