Even if it hadn't been Yhwach fighting, that would have been a fairly boring Bankai. It's just a massive sword. That's closer to his old Shikai than what you would expect from his Bankai. The dual wielding probably would have made a better Bankai, as long as he got to use it properly, rather than get one shotted by every quincy he met.
Granted, Kubo only designed the thing so Ichigo could get owned, but still.
Granted, Kubo only designed the thing so Ichigo could get owned, but still.