Longstreet unfortunately tarnished his wartime achievements..
John Mosby, arguably Lee's most effective guerilla, suffered a post-War fate similar to Longstreet. Following the War, Mosby allied himself with Grant & Republicans, and eventually became a Federal employee. Mosby's Virginia neighbors weren't really understanding. At one point he was shot at, (I think) his childhood home was torched, and Mosby eventually left for DC.
Surprisingly, Mosby's Confederate legacy still fared ok. I know there are still spots around Warrenton & Northwest VA that honor his name.. Mosby Highway, the Mosby Heritage Area (Foundation), some schools & Raider mascots, etc. Been thru that area over the years, in parts it looks like it hasn't changed since the Civil War. It's nice.
RE: Longstreet, he was so vilified by Lee partisans, part of me wonders if some his post-War decisions weren't simply a middle-finger to the other Confederates who were relentlessly dogging him (or is my timeline backwards ?). I feel like Longstreet was unfairly scapegoated for Gettysburg.