Playing Kingsbridge right now. The painting alarm can be turned off but even if you don't, figuring out the correct one to take isn't hard if you have functioning eyes. Also, you only have to "break back into" the prison if you miss the key the first time around, which you won't if you actually explore. Unkillable Cat proves to be a retard once again!
Feel free to point out other examples where I have shown myself to be a retard, particularly in regards to the Thief games.
But as to the current example that "proves me to be a retard"...
I always explore, and found the room in the prison where you get the key before leaving the prison. I also found the guard that patrols the empty but brightly-lit room before it. Trying to pick open the door leading to that key, without the guard spotting you, is impossible, and all you have at that point is one lockpick, no weapons. The author FORCES the player to backtrack back to the beginning once he has his gear from the tavern, and also breaks any chance of ghosting the mission. It makes sense to eliminate needless backtracking.
I'll admit that it confused me for a moment that of all the duplicate paintings, you could only take one of them. The reason was that I doubted that the author would make it so that Garrett instinctively knows which painting is the real one, that he can tell the real one from the fakes, without any information about the paintings whatsoever. Because that would make sense. Which this mission doesn't really do.
I was also aware of the switches that disabled the alarms. First mansion has it in the basement, the second one in the bedroom. I never actually found the switch in the third mansion, but I found the switch that disabled the camera but by that point I was pretty tired of the whole thing, so I just grabbed the painting and ran off.
It's not the fact that each painting alarm can be disabled that bothered me, it's the fact that the "gimmick" is identical in all three cases. The game "map" has a short bio of each of the counts, one of them is too poor to afford much security, one of them is too arrogant to believe anyone will steal from him and the third one is an art collector. All three having decoy paintings makes some sense, but that all three have bell alarms tied to them? The arrogant count at least shouldn't see any reason to do so, and the art collector would go for better security than a bell on a string!
The fact of the matter is that Kingsbridge isn't a completed mission. It feels too much like something in a late beta stage, where giving the houses distinct identifying marks is still on the "to-do" list, where an outside opinion on game design ideas is missing and some extra small touches to really bring the place to life is lacking.
But no...to Icewater I'm just a retard.