Six months ago here, in response to a Lua-advocacy post that I didn't like very much, I wrote a comment where I gave an overview of what I like about Lua: https://news.ycombinator.com/item?id=42519070

Shortly after that, we had a lengthy thread about "how Lua compares to Python": https://news.ycombinator.com/item?id=42655158

Two years ago I commented https://news.ycombinator.com/item?id=38862372 listing Lua's worst flaws from my point of view.