We grow this in sun and in partial shade.  

The grass on the left is situated in partial shade, looks good - diffused light shining
on/thru the red blades of grass is quite attractive.

The grass on the right is located in a sunny site. In more sun, it has much more red colouring.

This plant is very tender to our zone 3 garden. We generally can overwinter it a couple of winter then it disappears, and it's time for a new plant.

Hardy to Zone 5.

Glen's score:  9 of 10.

Note: yellow ornamental grass in foreground in photo on left is Hakonechloa macra 'Aureola'