I don't agree. A scale has to be useful for separating what you're measuring. Any scale that puts Kamala as "low" is like trying to measure the size of a banana and an orange in kilometers, they'll both measure "low". There is no decent measure by which Trump is anything but scum. Kamala (or just about anyone who isn't a Trump voter) ranks so far above Trump that they can't be anything under "excellent" on a scale designed to meaningfully compare these candidates.
Obviously the scale we should be using for our politicians SHOULD be better, and that's because we should have produced better candidates. With the candidates we have, we don't get to use a better scale because in doing so we'll be playing right into Republican narrative of "they're both the same" or Kamala is "low" quality so vote for Trump.