Every user's own experience confirms this. Add to this the old adage that 'anyone can publish on the internet' , has now translated into the situation that anyone does. Quality is a rare commodity, but not one limited to the big budget 'shovelware' sites funded by the corporates' deep pockets. Index things in an intelligent way. I think not.
Nature is the world's leading science magazine.
Many Nobel prize winners would sell their grannies to get their work published in Nature. One 'informed' reviewer thought it was too difficult to understand, hadn't heard of it, and recommended a dire pop-science site instead. Now bare in mind that this is a title that is essential 'bookmark' material for any serious scientist. They hadn't worked in science. They probably had been reviewing a Pamela Anderson site before visiting Nature.