I have had three unfortunate temps in my long admin career.

First temp had been compulsorily retired from a very high-powered post with an international organisation.  She managed to upset all my colleagues on her first morning - so much so that by mid-day they had christened her "Attila the Hun".  Most unkind.

The second and third temps had much the same problems.  Both wanted my job (and made it VERY clear they would have liked to step into my shoes) and both were hugely incompetent. 

Second temp couldn't type a simple letter without grammatical or spelling mistakes, let alone do anything more serious.  She managed to upset the President and Patron of our company, which requires some talent as they are both quite easy-going.  She set about undermining me - papers went missing, phone calls were not relayed to me, post went missing, she disrupted communications between me and my colleagues, me and my (new) boss.  In fact, she was thoroughly unpleasant.  After she had left, I discovered that a good part of her CV was falsified, and she fraudulently claimed welfare benefits and all manner of other evil things.  Her temp agency ditched her fairly promptly.

The third temp was at our offices for just one hour when she approached my manager to enquire whether there were any vacancies.  She sent confidential papers which I had specifically requested that she keep secure, to an entire Committee that didn't have any requirement to see them in the first place.  The latter led to a long investigation by someone from our compliance department. She also removed confidential notes from the company's offices - for what purpose we never found out. 

I suppose the moral of this for temps is: make sure you are sufficiently skilled; if you are looking for a job, then you may ask, after a reasonable time when you have had time to assess whether or not the company would be agreeable to you, whether there are any opportunities in that company and don't, whatever you do, ask the person you are assisting "When are YOU going to look for another job"!

Not to seem like a complete whiner, I would just like to say that I have met some absolutely wonderful temps.  One was from Australia and travelling throughout Europe.  She had an enormous capacity for work, was competent and always cheerful.  The other outstanding one was from the States and very, very capable.  We still keep in touch nearly nine years after she worked with me.