not bad
But some parts looked too hasty, like the fighting stances, they were too fast. You might wanna animated those a bit slower.
And you should slow down some other stuff too, like when the characters transform. It would look way better if you see Ichigo charge up, the ground begins chaking, an aura begins to form around him and then he scream BANKAI! The whole place lights up and when the light fades away, there he stands in his bankai form.
That might sound like making a big deal out of a simple thing, but it looks way better when you take a bit more time to build up the tension in a battle to make it look more exciting.
The aligning of the animations could use some more work too, you could see the characters shaking a bit, you can see that clearly with Sasuke, his fighting pose was shaking to the left and right. That looked really messy, try to keep the feet at the same spot, that usually works for the fighting pose.
Hope this helped a bit.