173 could be docile. All you have to do is make your containment cell have shower heads and a drain. Hell, the author may have even tried to change it to make more sense, but by the time he wanted to make edits, 173 was a big enough part of SCP culture that the admins locked the article down and won't let anyone edit it. 173 is a bad article imo. The plothole (there's no reason for cleaning to be done manually) breaks my suspension of disbelief and the fact that you have to open its cell is the only thing that makes it threatening.
Shy Guy (96) and Black Shuck (23) are both better, similar examples in the euclid class. They're not predictable and containing them is actually a challenge. There are a few other comparable examples that make 173 look bad (both in terms of writing and in context), but that's the essence of it. Why should I be scared of a statue that generates filth, when there's a monster that makes my family die when I look in it's eyes, or a monster that will hunt me down at the speed of sound if I see even a pixel of it's face? Why be scared of the statue that just rattles around in containment, when the dog will phase through walls and shy guy will run right through them?
EDIT: There's a sentient calculator (168), but it doesn't seem like it would be especially helpful.