I don't have a strong opinion on Kunreisiki; when I first came across it I thought 'this looks needlessly complicated' and just assumed it was old and outmoded so basically I've always ignored it. My first introduction to Japanese was from a friend who taught me the pronunciation and hiragana at the same time, so I got used to the sounds well before encountering Romaji. I only learned about the history of Romanization and took a more rigorous interest in the language years later.
