I hope Bastion isn't as OP as he seems. It seems like in recon, he is like Soldier but with a massive hitbox, no sprint, and no helix rocket. So probably still somewhat useful in a fight but with greatly reduced options. In Turret form he seems nerfed to the point where he hopefully has to set up closer. Being able to smash barriers is a good thing though. Probably frees up Soldier to hunt after targets that are better suited to him.
I imagine everyone would just treat Bastion ult like Dva's or McCree's ults. No reason to take it on, and every reason to just seek cover for a few seconds.
...unless it spawns some kind of Beyblade meta where you have Tank Bastion in place of Reaper? That would be pretty scary, though one shot per second is still one shot per second.