Every engine has it's flaws, but still, it's good to see from time to time that even the big ones can and do bleed.
I've also recently played another Unity game, Thea: The Awakening, it's made by ex-Witcher devs who went indie. On their blog, they hammered Unity for being bug-riddled, with new iterations breaking old processes or functions, they have to stick to an older version etc (NW 0.10.5 anyone? lol).
And the game hogs CPU like crazy, zooming out would cause major FPS drops even on beefy PCs.
But then I've also played Cities: Skylines and Satellite Reign, both made with Unity and both ran flawlessly. I didn't believe the games were made with Unity but it's true, they highly customized the engine to get it to handle such massive scope.