The movie is not overtly political, but it shows how American lives were placed in jeopardy due to State Department and CIA hubris. Despite repeated pleas for assistance, American military assets in Sicily, Italy and Croatia did not offer assistance to the besieged CIA compound. Why that didn't happened is never explained. But given recent events with sailors in the Persian Gulf, you can draw your own conclusions.
Here are some other reviews: AoSHQ, Variety, Dallas Observer, Reason, NY Post, and Northwest Herald
Instapundit: Trump rents theater in Iowa for 13 Hours, Learning from other's mistakes, Hillary's too busy to see 13 Hours (she was also too busy to send help when they needed it), Hot Air: Breitbart said: Politics are downstream of culture, Moe Lane, Rescue Team Turned Back, Paul Mirengoff: The movie and the politics, Yes there was a stand down order, reports from the premier, and yes the movie is good
American Power: 13 Hours reignites the stand down order
Hillary Clinton is not mentioned in the film. But the film without ever saying so certainly implicates her as the head of the State Department at the time and Barack Obama as commander in chief. Hillary's version of events differs from the families of the fallen.
Lem's Place: Family member of Benghazi fallen react to film '13 Hours'
Moe Lane, JLenardDetroit, and Ace loved it.
The Hollywood Reporter channels DaTechGuy on 13 Hours and the Alamo Benghazi
TOM: Rave Review by Breitbart's John Nolte