I apologize in advance for not having definite criteria/thresholds if that's what you're looking for, but do note that I usually support RfAs, especially if there's no major reason to oppose. There are a few maxims I have, which I list below:
- If NOBIGDEAL is the only reason for me to support a candidate, I will oppose that candidate. That does not mean that I necessarily don't believe it, it's just that I don't feel it should be a "Get the mop free card". Experience in adminny areas such as NPP, UAA, etc., counts as a "reason" for these intents and purposes, so this is hardly ever an issue and I apologize if I come across as menacing.
- Don't be an asshole or a smartass. Civility is key to being an admin; while I'm not going to grill you on this, coming across as insolent, cavalier, and/or rude during an RfA will make it much harder than it needs to be.
- I rarely !vote neutral on an RfA. If I can't support, I'll probably oppose or simply abstain, or go on General comments.
- Edit summary usage is key. The higher the better; if I don't see at least 90% usage or several month's worth of usage being above 90%, I will ask you a question on it, see below.
- Content creation isn't vital, but it helps. As someone with two Four Awards under my belt, I respect candidates with experience in the various Featured Content processes, and I will oppose if a frighteningly negligible proportion of your edits are in the mainspace. Having said all that, admins are first and foremost backstage workers, so I consider experience in those fields more important than content work.