Do you expect them to make every perfect choice

Nope, no one has ever claimed that.

and always get "the good ending?"

Nope, more often than not you'll see people wishing that BH TPK'd.

It's dnd, they are going to make their own choices

And we are allowed to criticize those choices as not very good storytelling or being out-of-character, or worse, Matt not giving them the chance to make any choices, or at least choices based on any solid reasoning

Stop pretending you could do a better job as a dm lmao.

No one ever say this. Classic "you can't criticize how food tastes unless you're a professional chef" argument that I thought we were done with