R-E-G-E-H-R, not R-E-G-H-E-R.
I struggled to find positives for Regehr myself, so I turned to langluy, a former Jewels from the Crown writer.
@dightkwing he can probably hear really well which would have been useful had the kings been forced to play in the darkness at any time
— mean machine (@langluy) May 12, 2015
That about sums it up.
Negatives
Everything else. The graphic at the top of this post is pretty telling. He did nothing well and he was given far too much ice time given his limited abilities.