Generally agree here. However the Apple icons of the pre-flat-design-era, even the really skeuomorphic ones, were always pretty great; I always thought they summed up most of their respective apps pretty well. For instance, for Gamecenter, the icon for it before iOS7 was quartered, with a chesspiece, baseball bat, rocket ship and dart board in each quadrant.

They really didn't need to change it. It's now just 4 coloured bubbles, which symbolises...what? I always thought it was just so...random. It's the most irreverent icon of the iOS home screen since iOS7.