I'm guessing you never used Google Drive's Backup and Sync on Windows. I used it for the first time a month or two ago. Simply clicking the system tray icon brings up a blank dialog that takes seconds to render. Both Drive and the sync tool have been around for quite some time so I expected it to be a polished experience.
I also expected the integration with Google Photos to be excellent since Photos is a major Google service, but in a terrible case of bad timing I just happened to attempt to use it when Google had a Drive -> Photos service outage.
The client used to be great when it was "Google Drive" but of course they had to rewrite and rebrand it to make it unbearable. Enterprise users, IIRC, still get to use the good client though.
I also expected the integration with Google Photos to be excellent since Photos is a major Google service, but in a terrible case of bad timing I just happened to attempt to use it when Google had a Drive -> Photos service outage.