I agree with you except my favorite line is during the the early morning scene on July 2, where Longstreet and Col. Freemantle talk, Longstreet said almost as a side note "we should have freeded the slaves, then fired on Fort Sumpter".
How true.
There are lots of good lines in that movie. I just particularly like the scene on Little Roundtop. I was there twice in 2013 and always marvel at the men who had the balls to come up that hill.