True, I forgot about the broken door*. As for the parkour method... it isn't THAT bad of an exploit in my opinion, now that it is well-known. Oftentimes there will be either defensive archers up above that side, or simply a defender who is just spawning as you try and parkour your way to victory. Not to mention that it is a time-consuming process, even when executed perfectly. You are completely vulnerable and highly visible for at least 15 seconds as you scramble up the side wall. Honestly I use this method as a defender more often than an attacker to get to the flag since it is more likely to be safer (hopefully there are more defenders around this area than attackers) than when attacking. This method helps to cut off an attacker you see going the back ladder. Ideally this map could use some work... the door on the back right side (looking from attacker's spawn) is nearly useless with the staircase right next to it providing a much quicker path. If this backdoor could be combined with a new entry point to the flag area, to replace the exploit with a legitimate pathway, then this map would be pretty good, I think. Unfortunately it isn't really worth discussing, since apparently we can't get custom versions of maps, even if we edit them ourselves or want to use an older version... oh well.
*Broken, or working as intended? You have to remember, back in the day to lock a door they would just bolt it shut with a wooden beam... fancy locking mechanisms with keys and such were far too expensive to be used absolutely everywhere. Not to mention most locks are relatively weak compared to a massive piece of timber. I kind of imagine that in order to get out of a gate you have to hold F to remove the bolt and then open the gate... who knows how you successfully close the door on your lonesome. It isn't exactly like you are just inserting a key, turning the knob, and then locking it back up as you leave. Well, that is my take on the situation, anyways. Nevertheless, not being able to get in from the outside still sucks for gameplay. This map should really just have a solid door instead at the flag, that way defense can open it from either side and they also aren't able to poke attackers through it... that is my main complaint with these 1-way gates.