http://imgur.com/a/eYmLK
Three of MANY MANY examples of how useless the settler pathing is.
It doesn't seem to matter how well thought out your buildings are the settlers screw it up on a constant basis.
While I hope they will, however I have ZERO faith that Bethesda will acknowledge much less fix these bugs.
It's REALLY frustrating. Do Bethesda actually have play testers on the payroll???