I never watch ACC games so couldn't comment.
Aside from the B12, I'm probably most familiar with SEC games because of watching games with my i s c & a aggie wife. I'd say B12 and SEC refs are about the same. Not great but not horrible.
I don't have enough experience to comment on PAC refs either, to be honest, other than that memorable, completely blown call that went against OU when they played Oregon many years back.
For the B1G, I watch it some, and haven't noticed anything I thought was particularly horrible, either.