Ugly visually and ergonomically. Default choice of fonts, mishmash of visual styles from across decades of development in the various widgets, non-native/non-p

Ugly visually and ergonomically. Default choice of fonts, mishmash of visual styles from across decades of development in the various widgets, non-native/non-pixel-aligned font rendering, context menus that relegate the most common actions to submenus while elevating actions that you're not going to use as much, alignment issues abound, use of modal dialogs for things that are taking place in the background and should be progress bar widgets instead, dialogs that need focus being placed under dialogs that can't be used until the backgrounded dialog is interacted with, etc.