Here's a meta.SO question about crappy review audits:

https://meta.stackexchange.com/questions/180417/clearly-wrong-close-review-audit-what-action-to-take

Questions for review audits are picked automatically and it's obvious from all the questions about them that they aren't always as clearly good or bad as they should be.  

The official SE response seems to be:

- the audits are needed to deal with all the robo-reviewers
- the automatic question selection is best they can do
- if you fail the odd audit there are no repercussions
- if you did get review banned because of a series of bad audits, you could "appeal" it

Basically, they aren't planning on changing anything at this point, even in the case of possible duplicates, where they know the audit doesn't work properly:

https://meta.stackexchange.com/questions/179651/close-vote-review-audit-flawed-fails-without-casting-vote

One of the comments mentions a bounty, there's a question specifically about that:

https://meta.stackexchange.com/questions/169486/a-reopen-queue-review-audit-shouldnt-show-me-a-question-that-has-an-active-boun