As noted, many complaints are rejected merely for lack of information. The Court needs to be assured that the correct person is being charged with the crime and be able to contact them, so identifying information about the defendant (including current address, phone, race, sex, and date of birth) is essential.
The prosecutor is also checking for evidence to prove each element of the offense, so the more detailed the description of the occurrence (including in many cases events leading to the offense), the better. And since the proof must be beyond a reasonable doubt, having extra witnesses to the offense is good - and hard evidence, such as photographs or audio or video recordings, is even better.