Hmm… I think S2 Chun is great. Having no problems doing well with her.
-St lk still works very well at far range as an AA, it may trade more up close, but I rarely have it flat out lose. Back roundhouse is amazing but you need to be able to react (practice it and it’s easy trust me), I still get people with crossunder with it… so will Capcom nerf that next?! >_>
-St hp is still amazing- do not be scared that frame data says -5, only certain characters can punish it and it requires them to have meter or critical art.
- Ex legs: She goes super far! Now I can whiff punish even better with it. It was already great in S1!
-Jump hk extra 2 frame startup I can’t even notice, I still use it with perfect success to stop jump ins at certain angles and it still works great!
-IAL… don’t care. I never abused it- vs good players they would react and uppercut/normal you. It still works fine if you think someone will tech.
-Damage nerfs- don’t notice. Because of grey life change things still die just as fast as before when I play. St fp, command mp, cr mk, fireball ender ranks on the chip. I do notice and miss the extra damage they took away from ex SBK when someone jumps on me.** Also in V-trigger you can now cancel low forward into heavy bird kick (won’t work off the VT overhead combo but otherwise will.) And they added +10 to cr lp in all circumstances. This helps too.** Also a reminder many other characters had damage nerfs, Chun’s really isn’t bad in practice.
-Throw range buff is useful and noticeable. This helps my Chun’s defense and offense as I don’t get punished or grabbed out of things with the improved range. Very happy, however you still can’t do a true tic throw (you have to slightly walk forward) because of the pushback on her light normals. 
- 4 frame cr lp: Don’t care. Still have cr lk for frame 3… but I block a lot on wake up anyways.
-cr lk is great. Now I have a real tool to punish all the walk back scrubs (read: 90% of people online.) It’s easy to confrim cr lk, cr lk xx legs and you can go into V-trigger if you wish from legs for more options.
Overall, I don’t think Chun is the best in the S2 game, however I never thought she was even in Season 1. In S2, she’s still super good and probably at least top 5. I think Urien and Guile are stupid good now. At least we are safe from Season 3 nerf hammer? 
Not Chun related, but jab AAs are still in for like, all the characters who had them in S1. They just trade more- like Chun’s st lk. But they still work. Disappointed Capcom didn’t truly amend this. 