Cammy got Two significant buffs going into Super, universal crossup j. lk (it was char. specific in vanilla.) This mean that after a back throw, or a rh drill, she had a high block 50/50 against all characters, on top of the low 50/50. But the high allowed her to combo into st. strong for significantly more damage, and if blocked, maintain offense due to frame advantage. This meant getting thrown by cammy was scary as fuck, making her up close 50/50 (dive kick or throw) that much scarier.
Her other buff was st. rh being extended, made her footsie tools better.
Her one nerf, DP going from 150 -> 100 was only a nerf in relation to her vanilla character, but in compared to overall damage nerfs in super her output remained proportionate.
I think she was high upper mid tier in vanilla, damage going down in super while hers remained the same for the most part, and a weakened ryu/sagat (who i felt she went 5/5 with in vanilla) meant she got a winning matchup vs. the previous games top tier along with akuma (i think in super she goes 6/4 vs. akuma/sagat/ryu, ken is the only shoto she goes 5/5.) The crossup j. lk was big because it turned her into magneto. So in Super, I can definitely say she was TOP TIER for sure. When i started talking about how good she was, people used to think i was dumb for saying she was so amazing, but as time went on people started to realize what a beast she was. For what it's worth, if she had her Super incarnation in AE, she'd STILL be top tier, since I'm 100% sure she'd have a winning matchup vs. the twins, mak, and SLIGHTLY lose to fei 4.5/5.5 (fei getting 400 damage meterless combo on her is friggin good lol.) Also she BODIES Viper (super.)
*sigh* I wish capcom left her alone :/
edit - Please do not look to James Chen for any representation of Cammy as a character, he's a great guy but honestly doesn't know what he's talking about. For what it's worth, I learned cammy originally from Buk, who pretty much designed how she's meant to be played while Chen was the most vocal complainer.