SilverWook said:

Using the Kennedy assassination as a plot point is nothing new. Quantum Leap, the 80's incarnation of The Twilight Zone, the Clint Eastwood film In The Line of Fire.

Gene Roddenberry once outlined a potential Trek film storyline reminiscent of City on the Edge of Forever, involving Kennedy. I kid you not.

Yeah that is one reason I think it just feels so cheap here. It feels like a really dated and overused sci-fi story telling device that makes me wonder if in the next movie the Xmen will go into space and end up on the planet of green amazon woman who all want to sleep with them.

It just feels cheap and silly to me is all.