Broken is a strong word, i had way less problems at launch with days gone than with your average bethesda\ubisoft game, maybe because i played on pro so performances were better but bug wise it wasn't that bad.
Some reviewers fucked up the game because it wasn't woke enough and deacon had a libido for his wife, they even fucking lied about a joke inside the game, or they never even played the game to completition.
Days gone was definitely not worse than ds1 or spiderman, i think only horizon and gow and tlou2 were better as far as first party but different taste and all.