Despite meta tags being discouraged now, the Unix and Linux beta managed to get three posts tagged [subjective] in the first three or four hours of the beta. Should SE sites start with a blacklist of certain bad tags that have a propensity for popping up on every SE site?
I'm not sure I agree -- I think each site should establish what its own community norms are without being held to the norms of a programming site.
That said, I do expect some standards to emerge, but I'd rather watch and learn than being overly prescriptive from the beginning.
edit: we do now support the concept of "intrinsic" tags, that is:
In other words, an intrinsic tag is one that functionally "exists" on every question because it is at the site level.
This intrinsic tag feeds the blacklist and also works to vet and validate question migrations to make sure they are somewhat valid; migration candidates must have at least one tag in common on the target site including the intrinsic tags for the site.