After taking a look at it I can say:
1 You're new to mapping. Please visit
www.interlopers.net to learn more. There was a time when my maps looked like that too. It was when I started mapping a year ago.
2. This map should actually be placed in the WIP mapping section since it's not actually complete. This map is clearly in an early stage.
3. You have placed too many weapons. They respawn, so try to keep the numbers down.
4. It seems your npcs are having a hard time to navigate. add info_node entities in your map. They are used as navigation points for most npcs and should be placed about 30-60 units above the ground.
5. The map has no point excep of killing the npcs. Always plan your map before you start making it. Don't just create a huge room of some sort where you stack in some random enemies.
No offence, bet you need a lot of training as a mapper just as everyone else. I suggest that you visit and subscribe to the Interlopers' forum to get a good starting point. There are many kind people there to help you out if you get any troubble. (you also have a mapping help section here on this forum. recommended if you have obsidian specific questions) Also I suggest that you start working on a map, or carry on the work on this one to get the hang of hammer. Please post your results in the WIP mapping section as long as the map isn't finished. One day you might be a really good mapper, but that is only if you try hard and carry on mapping all of the time!
Keep the spirit up and no one can stop you from becomming a good mapper!