It's going to be movies like Rob Reiner's "LBJ" that will make theatrically released biopics a thing of the past. Nothing in the film is downright bad (except the absence of a single meaningful minority character given the time-period), but it's nothing an HBO miniseries couldn't do better. This is mostly evident by the film having four title-cards of paragraph-long exposition precede the end credits.
Apart from distracting makeup, Woody Harrelson did the best job here, but that's a pretty low bar, since all of them looked like they're just playing a caricatural version of the characters. The overall writing was a mess though, the back-and-forth timeline, lazy expositions, not to mention cringeworthy popular references.