I just wound up 33 years of teaching the American Revolution on the college level. That doesn't make me an expert, but I do know something about the subject.
Movies have to do things differently than scholarly books, because movies have to get people to watch them. So it isn't reasonable to judge movies as genuine works of history.
Having gotten that caveat out of the way, i do have some personal opinions about Revolutionary War movies.
I really like "John Adams." It got the story pretty close to right, and featured some really fine acting. I thought Paul Giamatti and Laura Linney had the Adamses nailed perfectly. (Trivia: did you know that Mr. Giamatti's father was Bart Giamatti - the Commissioner of Baseball who threw Pete Rose out of the game?) And David Morse did the best job I've seen with the impossible role of George Washington.
I like "The Crossing." I thought Jeff Davis did well as Washington, and the battle scene was fine. I did think the interpretation of Henry Knox was a bit over the top, though. I bought a DVD copy in the gift shop at Mt. Vernon. It contains a line that I don't think was in the one aired on A&E. Let's see how much of it the electronic censor lets me quote. Washington says to Knox: "Henry, get your fat ass in here, and don't swing your balls or you'll capsize the boat." [Well, I guess that one got by. Moderators - please don't ban me.] I think it was an ad lib; the actor playing Nathanael Greene practically chokes with laughter. Great line, but it somehow just doesn't seem like the sort of thing the father of our country would say.
I have to say I thought "Sons of Liberty" was utter garbage. The narrative had big mistakes in it, and the depictions of the historical figures - especially the anti-revolutionaries - were downright offensive. And the Battle of Bunker Hill was one of the silliest renditions of a battle that I've ever seen. (Did anybody else notice that there wasn't any hill?)
I like the narrative in "1776" - especially the treatment of the slavery issue. I do think the depiction of Richard Henry Lee as a buffoon is pretty awful - and I didn't care much for the music.
A movie that rarely gets mentioned in this context is "The Devil's Disciple," which is based on a play by George Bernard Shaw. You haven't lived till you've watched Sir Laurence Olivier play General Burgoyne. The last line is classc: "General Burgoyne surrendered at Saratoga, and history told lies as usual. But the rest of this story is fiction. You can safely believe every word."
What can follow a line like that?