I was kinda rude about this map during the test so I'm gonna clarify some thoughts here:
Basically all good TF2 maps are designed linearly. Red spawns at one end, Blue spawns at the other, and they meet somewhere in the middle, which I will call the "line of battle." (Teleporters and spawn wait times influence where the line of battle is.) The match then becomes a matter of each team trying to maintain or push the line of battle towards the enemy. This is more or less the core component of how TF2 plays as a team game about controlling territory rather than a solo deathmatch game.
Objectives rely on this. On asymmetrical maps, objectives are placed on red's side of the line of battle so that blue has to push into their territory to capture the point. Once blue captures the point, spawn times and positions adjust, then shifting the natural line of battle (i.e. where the line of battle is before blue begins pushing) shifts forward, allowing them to then push further into enemy territory.
If you do not design the map in a way that forces players to fight together, they often will not choose to do so, and the line of battle really never properly forms. The game becomes a mess of players trying to flank each other and attack in places they really don't belong. TF2 stops being a team game about controlling territory and more of a solo deathmatch game, which it simply is not designed to be.
There is an apparent exception to this rule, which is Thunder Mountain Stage 3. First off: there is a lot of debate on whether or not this map is actually fun to play. However, secondly, and more importantly: Red and Blue spawns are placed on opposite sides of the map and the cart path is always in the middle, rarely being all that much closer to one spawn than the other. The line of battle is much fuzzier on this map than others, but it is still roughly maintained through some careful design decisions.
All of that aside: It may be worth trying to do the best you can with what you have and detailing this map so that you can get experience detailing. However, the layout is pretty fundamentally flawed.
