A hot take draft grade from a kid with a blog might be useless.
The aggregate of professional knowledge and assessment is not useless. And without exception so far, every professional grade I've seen offered on the Rams draft this year is in the C range. It is useful, much more useful than no information at all or throwing up your hands in the air almost hoping that nobody knows anything because you don't like the answer you're getting.
It is not perfect information or a guarantee. It's just information and it's useful. Whether you choose to use it or not is a different matter.