Grant I do so agree, the lack of basic stuff is truly frightening and even more so when you look to see where they work and how much they get paid!! I now have 10 basic questions for the agent to ask over the phone, the candiadte may drop maybe two answers otherwise no further.

You should try asking if you can have a non clustered PK, I'd say 75% of candidates have got this wrong - this is fail level for anyone reading - I'd never progress a candidate further who got this wrong.