If the start menu had been done with a bit more imagination and less restrictions due to the lowest common denominator on supported platforms it would have been a good step on from 7, the lack of decent group management/editing features, lack of any real ability to edit the style and theme, lots of restrictions on layout and what you can and can't drag and drop onto it, etc. just leave it far less useful than it should be on a desktop. Trying to do anything other than the one style MS have envisaged ends up with a super clunky, ugly mess.
EDIT: Also starting to really bug me that short of playing around in regedit i.e. HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics and/or hacking custom themes I can't see any way of adjusting things like titlebar height and colours, etc. while the default ones are a decent size for a touchscreen they are just wasted screen estate on a desktop with keyboard and mouse.