I have never owned any ARC gear, But have never thought of it as mid-fi
Always sounded decent to me when I ran across ARC systems.
I have friends who have owned and thought very highly of the brand.
Seems some here like to berate certain brands, Opinions are like butts everyone Has one.
Maybe if you have no bad personal experience to share about a brand, your opinion might be best kept to your self. There are a multitude of reasons why you may or may not appreciate a product.
Better to say you it's not for you than insult the owners of the product.