I had Fusion 8.0.0 and installed Windows 10. Right out of the box - with zero tweaks - the display looked great. It was "right sized" and scaled nicely for my retina MBP screen.
Upgraded to 8.0.1 and everything continued to look good.
Just upgraded to 8.0.2 and the resolution on the Win 10 desktop got very very small.
Attached is a screenshot of the comparative resolutions. On top is the "About VMWare Fusion" window. To the right is sample text from lipsum.com on Chrome in OSX. Behind is the sample text from lipsum.com on IE in Win 10.
I've reset scaling to 200%, but it feels like system UIs are abnormally large. Could just be my imagination and it was like this before the 8.0.2 upgrade.