Eh... I don't know if I'd say she's better. Certainly not in a vacuum, probably not even relative to the rest of the cast. More fleshed out maybe, but that has little to do with the changes in 3.5/3.6beta. 3.02 ZSS was underrated, if unconventional and a bit "gunked-up" in terms of certain things not working as they should.
You could easily make an argument for her being overall nerfed from 3.0, even with the de-gunking. Paralyzer is obvious, down-b mostly nerfed (kick partially buffed), nair arguably nerfed (less range, damage increase limits comboability slightly), fsmash either nerfed or bit of both (might kill sooner? rear hits don't combo as well), dsmash maybe nerfed (damage/knockback were reverted to 3.0 in 3.6beta, think it still carries less momentum on startup though), jab1 arguably nerfed (doesn't jab reset as long), upb hitboxes are smaller, side-b arguably nerfed... and of course tether recoveries as a whole got nerfed. Her only clear buffs from 3.0 to 3.6beta are utilt, dtilt, usmash (still awful, but maybe not for the reason I initially believed - poor coverage on the final hitboxes might be its biggest issue right now), fair (could perhaps link a touch more reliably, but definitely buffed), and dash attack.
Then there's the ever-controversial grab, the one change that changed everything. Even setting aside the changes to her throws, it's actually rather difficult to argue that the new grab is a straight buff outside of a vacuum. Changing her grab broke so many existing interactions with the rest of her kit. It drastically altered the way she interacts with the rest of the cast, because now she has to operate at a different spacing and with different tools in order to get that grab. I don't think people really understand how that single change affects her matchups or even just the overall cohesion of her kit. The old grab didn't just make sense in her kit, it was an integral part of it.
Nine months after the fact, I'm still baffled by the direction she's been pushed in. Early ZSS had the makings of a brilliant character built around amazing movement and unique, interesting vortex gameplay. There are still some elements of that design in place, but much of it has been supplanted by normalized leftrightleft and dthrow->techchase mechanics and I firmly believe it's a downgrade in design. We don't need a female Falcon wannabe.