While there are plenty of non-anecdotal reasons to criticise scrum, I am so very, very, very bored of the armchair criticism of scrum that comes entirely from very narrow personal experiences and second-through-seventh hand anecdotes that emphasise the negative and leave broad gaps in the story telling - story telling that frequently relieves engineers of any wrongdoing and even elevates them to pure machines of 100% efficiency being restrained or tethered by the shackle of scrum.
It was tiring 20 years ago when I started to hear them and it's no less tiring now. Show me a thousand scrum/agile critics and I'll show you zero better methodologies given back in return.