I don't find it to be too hard.
Once I lost all my sound and the whole enemy team turned invisible, so all I could do was playing a medic (Light bodytype) and guard/revive the prisoner. And basicly I won the mission while my team dealt with the enemies.
Spawn trap the enemy and you'll be fine. :wink_smile:
This is one initiate Problem of the game, imo. Technically, every map can be won by spawntrapping the Attacking side. Container City and Aquarium are very easy to figure out, but once people know the other maps as well, you'll either spawntrap or be spawntrapped.