I think stealth in general could use some tweaking. It works both ways for the oddities.
I can be stealthed, use shuriken from a distance to open a locked door. Now, without ever even being in a situation where I could be spotted, the creautres come out of the room and seem to spot with eagle-eye precision. You can even be around the corner and as soon as possible they will spot you. Then there are the skeletons and zombies that pop up out of the ground that can spot you ever time while stealthed. Just doesn't make any sense to me.