[2 replies while posting]
If you start discussing bad admins, and then someone else argues against your reasoning of why they are bad admins, and that discussion continues to grow until it is the only thing discussed for 50+ consecutive posts, all the while most of the participants are making no effort to be civil, and insults are being thrown in every direction like the remains of a goblin army that just dropped 50 z-levels onto a rough granite floor? Obviously not.
If the discussions stay short and polite? I don't know, but it's more likely how the discussions proceed rather than the specific subject they relate to that would be the problem. Probably safer to avoid potentially problematic topics, though, unless you are certain that everyone who might reply is mature enough to keep it from spiraling out of control (a very hard thing to avoid on a public internet forum).
Hopefully, I'm just stating the obvious, but it's likely that exactly the people who don't think it's all that obvious are the ones who might accidentally, or even intentionally, start the sort of conflict that would likely lead to this thread being locked just like all the others before it.