1- Coba berry scrafty can't set up on crobat, and for some reason I didn't mention crobat as a mon that comes in on an already +1 scrafty. Moxie needs scrafty to have a kill beforehand, which most often than not won't have for free.
2- I'm not saying metagross is bad. I agree with what you say, but it's not S. Even in Umbra's last post, he brought a banded mon that has severe prediction issues and that barely beats one of the "Offensive" stuff I mentioned. Yes, it can run plenty of sets, yes it can tank a lot of stuff. Then what? If it doesn't beat the most common mons with ease and without relying on massively outplaying the opponent, how is this S? If you try to compare Metagross's utility in UU with Garchomp's in OU or Mienfoo in LC you will realize Metagross falls way behind those two.