I recently suggested the following tag wiki excerpt for the diablo-3-crusader tag:
Crusaders are the sword and board class for Diablo 3 Reaper of Souls. These champions of the faith are expert in the use of shields. Tag meant for questions specific to the Diablo 3 Crusader class.
I get the standard rejection notice: "This edit does not follow any of our tag wiki guidelines and is unlikely to help instruct future visitors in the appropriate use of the tag."
So I follow the link and get the guidelines:
Keep it short! Yep, under 500 characters.
"Avoid generically defining the concept behind a tag, unless it is highly specialized." No, not generic and yes, highly specialized (only for the Diablo 3 Crusaders). It gives the parent game (and notes that it is from the expansion). It explains what differentiates Crusaders from the other classes (they are the "sword and board" class and thus expert in the use of shields). It is quite specific to this game.
"Concentrate on what a tag means to your community." It only provides enough detail to identify the Diablo 3 Crusader's place in the world.
"Provide basic guidance on when to use the tag." It explicitly spells this out -- the tag is only for questions specifically about the Diablo 3 Crusader class.
"Some tags are common knowledge." But this one isn't. Unless you are interested in Diablo 3, you likely have no idea what a diablo-3-crusader might be.
It's a tag wiki excerpt for one of the classes in a serious, top line game that already has more than enough questions to maintain the tag. It should exist. As discussed elsewhere, it is better for a weak excerpt to exist than no excerpt at all.
And yes, I'm still aware of this post. I don't see how it applies though. My excerpt looks much more like the examples of the good excerpts than of the bad ones. There's no opinion in it.