KDE4 was also terribly bug ridden. I used to advocate for KDE heavily but after suffering through bugs in KWin and KMail/Akonadi that went unresolved for years

KDE4 was also terribly bug ridden. I used to advocate for KDE heavily but after suffering through bugs in KWin and KMail/Akonadi that went unresolved for years I gave up and moved to Gnome. There was a KWin bug that filled the task bar with graphical artifacts over time so that you couldn't tell anymore which taskbar "button" was for which window. They kept blaming the video drivers until someone proved to them that they had a resource leak in KWin. The KMail/Akonadi bug that I still remember vividly as it was very annoying and long lived was one where you would get messages duplicated.