What annoys me? People who bust on doctors and talk like we are a bunch of idiots. Most people have no clue how difficult the practice of general medicine can be.
The people that bitch about it are the people who don't take their medication, don't get their tests done, don't follow up regularly, lie to you about the symptoms they are having and wonder why you can't figure out what the heck is wrong with them. The tricorder was on Star Trek.
Medicine is not an exact science, in fact, it is still relatively young. We do our best, and for the most part, everyone has the patients best interest at heart. There are bad outcomes, yes, but there is a lot of good that we do.