I have doubts that someone stepping in for 2 hours of interviews can consistently and accurately determine whether or not the company in question is in the deathgrip of stack overflow fads and dumb blog posts.

In anything but the most egregious cases, anyone making such an assertion tells me more about themselves, than it does about their interviewers.

In the rest, the correct judgement to make after a bad interview experience is "I don't have enough information to make an accurate judgement about how this company runs."

Yeh you can - gets easier with age and experience

Unless you're going back to all these firms, to confirm your first guess, you have no idea if you are actually making good judgements, or not.