There might be something wrong with me but I like the sharper look.
And the lighting is definitely going in the right direction.
First time since Odyssey launched I could put gamma back to default and use my normal screen settings (until now I had to switch to a different profile of my screen to be able to see anything in Odyssey).
It's a nice perceptual improvement, but set it too high and it creates harsh fringing between contrasting pixels which makes it hard on the eyes for long periods.
But where "too high" falls is subjective and down to both personal preference and eyesight, hence the slider.

The examples given above are a smidge above the "too much" threshold for me, but everyone's milage varies.