I'm not a bag person so no idea if it's considered good or not by stylish people. It looks fine to me.
What does it say about the wearer?
Same as any product with the designer name as the main feature - it says the person wants the name visible for a reason that matters to them. They want to be associated with the brand. Maybe they just love it so much they want to shout it out, maybe they want people to know they buy that brand, or see it as a status symbol, or indicator of wealth, or indicator of style or fashion sense , all sorts of possible reasons.