Well, there's no need to be brutal, I think you already heard all you needed to know for now. It's overscaled, which means it takes too long to travel from point to point and it creates rather big sightlines in places.
Don't mix up blu and red textures, it makes stuff confusing. You don't even need signs if you do this, because you just have to look at the color of the walls to know in wich direction the objective is.
General layout is simple enough (in a good way). It's rather difficult to formulate an opinion on point layout because it would play very differently if things were more compact (there would be more players fighting in the same areas, for a start).
I don't like the dropdown out of the initial spawn, try to put some stairs somewhere to get back there if possible. Also you don't need resupply cabinets in forwad spawns if their doors are one-way only. However there needs to be more ammo and health available. Playing engineer is already a little annoying on 5-cp maps, don't make it bothersome by forcing us to run around the map looking for boxes