So I found out they made some moves in SFIV harder to pull off with Cammy (my main) so they're basically the classic style moves, and on HDR, I cannot, for the life of me pull these moves off with my Fight Pad. Especially the Hooligan Throw considering it's so close to the Spinning Backfist in terms of how you do it.
Anyways, I went through HDR again, this time on Hard Mode, with Cammy (In HDR mode, of course) and I manged to beat it without too many issues. Zangief gave me the most issues. On harder difficulties the AI is a lot less spam happy, but it still happens. As a trade-off, they're more pixel perfect than ever with their timing. How I hit Sagat with a Super attack and die while he doesn't is beyond me when we both have no health.