Zarya's probably a bit overtuned, but I don't really think she is that OP or even a big problem. There are a lot of other things to look at right now I think.
Also I'm pretty solidly convinced single character counters are more or less dead at tournament level anyways. There are favorable match ups but that's about it. Team comps and that level of play are way too optimized to let shit like that rock.
With that being said, Ana is on some pretty nuts shit right now. She's def the current "enabler" of a lot of bullshit.
Also, to the poster above me, a good number of pros complained about D.Va's DM being busted. A lot of it was like "meta makes it so she's not that good, but trust us that thing can be a problem"
Zarya's status
on console is the issue. Right after the Aim Assist change, her beam's range feels like it doubled. I don't really know how else to say it, because it wasn't Aim Assist itself causing this feeling, as her beam was pretty damn easy to aim consistently before.
She wasn't a problem before. Now, she's starting to feel like she is. There's a clear divide between pre- and post-patch.
I agree with Ana needing tuning. She heals incredibly fast, with the caveat that she has to hit the target, while building Ult (increasingly one of the best in the game now that even random groups know what to expect out of it) at a ludicrous rate.
I can't see any way that the Ult gain rate isn't slashed.
EDIT: Tracer is my go-to for Zarya counters. She has it all. 3 clips does it, as long as you keep a steady harass going.