They list "national chains" with no regard to how individual locations are managed. Thinking that a hotel's rating should be a general indication, I booked a over night stay in San Jose. BAD IDEA. The place was run down and dangerous. It had structural damage, window's busted out and a long history of criminal activity. I walked down the street to stay at another location, so had to pay for two hotels that night. When we complained to Booking we got "we'll make a note of it" but because it was a national listing they weren't concerned with pulling the listing.
Their interest is more in the quick dollar than the safety or repeat business of their customers.
I will never use Booking.com again and will make every effort to tell everyone I know to stay away from it.