Ah, so this was the map we played yesterday.
Wide staircases seems to be a Ravidge signature, i remember them being common in your CTF contest map too. I can't say i'm a fan as they feel cumbersome to fight at and unnecasserily consume space, but that's just me.
A couple things i would say is that the map is kinda a bunch of pseudo corridors and whilst it's not entirely detrimental to combat because there is enough space to fight, it does make it difficult to navigate when you're surrounded by walls/large buildings with a limited FoV. In many CP maps doors open in to large arenas where you can immediately see where you're entering from, where you need to exit/progress too and where the objective is (along with the likely position of defenders). This wasn't totally true playing this map as CP's were hidden behind complex geometry like catwalks, minor walls or other solid obstacles like medium sized props or solid structures.
Also, often the number of arrow signs present was just as confusing as if there were a lack of them. Place arrow overlays above or beside doorways and less of them on walls as they didn't help too much as is. Doing so will help players understand the orientation of the map, which way is forwards and backwards amongst all the corridors. I spent a lot of time looping around buildings or walking the wrong way.
Last was a massive pain in the arse to assault as attackers basically had to complete a small gauntlet of obstacles whilst being shot at by snipers, rockets and grenades from a balcony next to the defenders spawn. The doors also didn't help. Getting to the final CP needs to be a lot more fluid and the CP a lot more obvious as the focus is on the significant threat from the defenders spawn ledge and not the CP behind the train. Most of the time players took up cover on one side of the train flatbed, shooting back up at the continually spawning defenders, whether they noticed the CP or not wasn't clear but at the end of the day it took a long time before anyone successfully jumped onto it and captured it.