The central criticism of the George Zimmerman trial is that there was one. It was simply impossible to convict him of anything beyond a reasonable doubt.
The central criticism of the coverage of this trial was that there was any. How did this story merit consideration as national news? Why was the death of Trayvon Martin a thousand times more newsworthy than any other person shot on an American street? Answer: because Al Sharpton and other race-hustlers wanted it that way.