Where would we all be without gparted? Simply an immensely great tool and would also category it as a distro of sorts.
Rate gparted with a perfect 10 simply because it does what it suppose to do and it does it well. Yes, there has been a few occasions when things weren't quite right, but that may rest on the heads of other application devs and also file systems.
Improvement, yea they could say good-bye to the outdated look but it's a tool and as long as it works it's fine with me.