Cytosolic

If you want to make a fun and enjoyable map, try standing in any part of any map, valve maps are good, and ask this question. If I was on Red/Blu how would I beat another player at any other point on the map. I'd recommend you ask these questions with specific classes as well. For example, how would I beat a scout there as soldier here.
Got that? okay, how many different options did you have? Was there a clear best option? An only option? Was there a hard choice between two positions, health and ammo or height? These are good questions, ones that, as mapper, help to find what makes interesting and fun level design. Try asking these sorts of questions around your map. Don't take, I can move around this field, for an answer either. Be honest with yourself. If you can't think of a good strategy to play your own Map no one else will. Remember this, if there's no way to gain an advantage, there's no Strategy. If there's no strategy, it's a battle of stats not skills. That's not fun.