The Doc doesn't get to see much Sagat usage for some reason.
It's mostly Rufus, Zangief, and Blanka rounding out the hate tower in SFIV.

Blanka, to be such a simple character, is annoying as hell.

Zangief is a pain if you're not using Ryu or Sagat. Even then, a good Zangief requires precise comboing and FADCing to keep him the eff away.

Rufus can just lick an asscrack backwards. He's not one that needs to be nerfed, but the million ways he can get his ultra off is silly.