I have a D5 which I tend to use for holiday dives rather than my Perdix (which is great, but a bit clunky and unnecessary for simple rec bimbles).
Whilst I too was a little disappointed with the brightness of the screen above water, I actually find it surprisingly sharp and easy to read underwater. I would say that the marketing literature gives an overly optimistic image of above water clarity.
One completely subjective screen test involved taking it down to the dark depths of a local quarry alongside my Perdix. Whilst I find the Perdix screen perfect for my middle-aged eyes, I could still read the D5 without any difficulty. I think it's something to do with the contrast rather than basic brightness.
Anyway, no complaints from me. Yes, if I was paying like for like, I'd probably have a Teric, but over here with a DC keyman discount it was a fraction of the price.