The RF-8's going in was the only watchable part of that movie, though I think Bruce Greenwood is a very underrated actor who did a good job of portraying Kennedy without devolving into caricature.
But on the whole, the movie clearly swallowed RFK's version of events (it was based on his book) and perpetuated the hagiography of JFK. The magnificent president was the only thing standing between his warmongering generals and WWIII and all that. I'll be the first to agree that Curt LeMay was a strange mammal, but no historians have ever been able to find any evidence that - as the movie and JFK's apologists insist - he and the rest of the JCS were damn near conspiring to get a war started behind JFK's back. Shit, the Kennedys had an obsession with toppling Castro that amounted to a personal vendetta.
The scene with Robert the Strange MacNamara shouting down Admiral Anderson and schooling him on how the world works was complete horseshit. The suggestion that the Chief of Naval Operations doesn't understand rules of engagement or the political implications of a blockade...I mean, come on.
* Though Admiral Anderson's line to the effect of, "The Navy's been doing blockades since John Paul Jones," essentially telling MacNamara to fuck off and quit micromanaging, really did happen. Of course, the movie spun it to make CNO look silly and clueless.