Pym, Ultron didn't overpower the Sentry in any way though, did he? I don't want to reread Bendis shit, but that's what I recall at least. There's no reason why Ultron couldn't go into high herald though.
Well, even if Thor was tired she did very well against him.
She was also beating the Guardians pretty good up.
I suppose it depends a lot on whether or not her "old" feats count, but high meta just seems too low.
We also need to add Valkyrie to the list. She should go high meta imo.
Also Eddie Brock Venom could go into low/mid meta.