Honestly I'll admit I didn't do well technically, but every interviewer I had just seemed super impersonal and not very friendly. They asked very interrogative questions, and while I get it and am mostly ok with it, I felt like they were asking due to the existing environment they have there.
I just didn't get a great vibe.
Disclaimer: But again, I know I didn't do well on the technical stuff so maybe I'm biased negatively toward the experience.