Among other things:

• monochrome color scheme prevents easy recognition of tools
• dozens and dozens of arcane options listed alongside super basic options
• weird sizing of buttons
• no help search, and no search that can associate synonyms where users don’t know what term to search for
• no inbuilt suggestions when user behaves strangely (eg. user is spamming the escape key, searching “deselect”, maybe suggest the deselect all hotkey?)