There is a great quote along the lines of "when someone shows you who they are, believe them"

I don't think there is a proper answer to this question, but my vicarious experience is that the interview process does indeed tell you alot about who a company "is". If there is any exaggeration, it's usually in the positive direction, to the extent that this is the time when everyone is on their best behavior, so it's more common to have a slightly better impression of an employer than the reality.  

Think of having a first date.  If your date - no matter how atrractive, wealthy or talented - shows up late or not at all, shows no interest in getting to know you, etc. would you agree to a second date, let alone agree to a LTR with them?  I hope you would not.  That's what's going on here, from what you have described.  

I would run.  Far and fast.