You really need to have patience or pick slowish times to see the doctor of your choice.There are some terrific doctors like Dr Mikhael or Dr Thomas who will take time and examine and leave no stone unturned.
If you go the first available doctor you pretty much get anything and therefore can't really complain. Some are hopeless and dangerous.I have been shown by a good Dr that he sees about 30-35 a shift compared to some 75-80 just getting them in and out for the money.these patients usually end up having to come back and seeing one of the good docs for an extended period.
If you do have a usual doctor who you like and have a quick appt such as a script to pick up or med certificate try to be loyal and see them so they get a nice quick one and they'll really appreciate it and build a good Dr/patient relationship.
It is very easy however to get a med certificate for a day off with the useless docs.You just tell them what's wrong with you,they agree and show you the door.