Not even indoors will you find many areas that can be controlled by shotguns. SMGs yes, but not shotguns. Old video but still true. Shows a bio-lab with render distance set to 15m. CQC maybe goes that far in PS2. Notice how often you have ranges that go well beyond 15m even in a bio-lab and how little cover there is for CQC ranges. This is what a CQC map looks like. Hard, half, and soft cover EVERYWHERE! At 3:07 you see an overview of a part of the map with just past that him running to the point area. So much cover, so many plants to block LOS, and everything can be used to force CQC fights. And the other half of the map for point A has even more cover. That is a CQC map. PS2 combat is not CQC. A few areas are CQC but once you let the enemy to those areas then you already lost the base. PS2 combat is controlled by the courtyards, fields, and holding the walls of a base. The idea is to not let them inside your base if at all possible and to push them out of it if they get in. Fail to do that and you wont win fights. VS gear lets them hold those areas better than TR/NC. Starter weapons that are made just for those areas, AOE weapons to control bottlenecks, and a MAX that is by far the best for those areas in not just AI weapons (who are the most accurate) but the MAX with the smallest frame to make it harder to get return fire.