It looked OK on my 4K screen when I installed it. I however fairly quickly went back to 8.1. It's soooo slow, lagging mouse pointer slow. There are lots of 'proportion' issues as well that aren't there with 8.1 (task bar too small, title bars too large), I couldn't get the Display settings to anything close to comfortable.

It also looks a mess, mainly the random font sizes, but also the fact that they've tried to modernise everything, like menus, etc. (that they clearly didn't get around to with W8), but there's still aspects that have been forgotten and are in the W7 style. So there's W7+W8+W10 all in one. I didn't mind so much with W8 because 'modern' was 'over there', and W7 with some flat tweaks is 'over here'. But now it's all thrown together. Not pretty.

Then when it would only randomly 'see' certain domains on my work VPN, and just be blind to others, I'd had enough... and bailed. I've never bailed on an OS before, always given it a chance to settle in. W10 just doesn't feel finished.