This film is about the assassination of US President John F Kennedy but cetainly isnt a conspiracy thriller. Oliver Stone made that film back in 91, this is something a bit different.
The film is more of a glossy look at certain characters and how they were affected that day in November 1963. The doctors/nurses, Secret Service agents, the FBI, Abraham Zapruder (who shot that famous footage of the shooting) and Lee Harvey Oswalds family are all featured. You probably wont find out much you dont already know about events but its still an enjoyable overview of a traumatic few days. Personally I found the glimpse inside the Oswald family the most interesting, his shrill mother and reserved brother being two of the more memorable characters.
The Dallas of 63 is excellently realised and the way they've used real footage from the events is very effective. The acting is mostly top notch as you would expect from this impressive cast list. The film also draws interesting comparisons between the deaths of Kennedy and Oswald - showing the same medical team from Parkland hospital fighting to save both lives (at different times and to different extent) and between the two starkly different funerals.