very simplistic — since when it's a bad thing in logos?
letters are not used:"F" and "D" — http://coinmarketcap.com try to find a logo with not just the first letter of a coin name
poorly identified with  "NFD" — as well as bitcoin, litecoin, nxt, darkcoin, namecoin... should I continue?
no offense   — non taken
need more work — please do


This logo is unique and well recognisable. You can even draw it with a pencil and everyone would say: "It's NFD logo".



It also contains a currency sign because of two separated lines.