Windows XP
When Windows XP first released, people criticized it for having a theme that they hadn’t seen before in Windows. People thought it was very kiddish and appealing to children, not being taken as seriously for the large userbase of the time. There were also criticisms about how fragile Internet Explorer was (I’m not kidding, I was there and Internet Explorer back then was at its most insufferable.).
But these days, just because of how bad Windows 8, 8.1, 10 and now 11 have been, people have praised Windows XP so much.
A long time ago, Steam was hated on its release. People just wanted to play Counterstrike and Half-Life 2, and this studio with like three games wanted you to install a launcher and taskbar app for it, and make an online account to play a singleplayer game.