I love this post!
This is exactly how I feel about John Stewart. I'm in the minority but I really think the Justice League cartoon hurt the character in a lot of ways. I loved the John Stewart of the 80s and 90s. He had a brash and witty personality that was so unique. Then the animated series turned him into this stoic marine prototype. He lost all sense of his rebellious nature and became a boring stiff and a "good soldier". I find that version of John Stewart incredibly boring. Sadly that's the version most of his fans fight for. John Stewart in Mosaic was such a brilliant character and light years better than the JLU version. Sadly I don't think we'll see that version of John if he ever appears in the DCEU.