skimpy, little cover, no real design (only CP is near the defenders base which basically makes it impossible to capture) and easily enemy-accessible "spawnrooms" and an empty admin room that might as well not be there.
Before making a TDM try examining other TDM's either posted on the forums here, or in different games. Look at the level design and how the terrain/structure, buildings (if any), CP locations, and spawnroom locations work in sync to provide fun gameplay.