Marketing and lying about a crappy product does the company no good. People will either pick up on it right away, or leave soon after using/buying it.

Good marketing teams will evaluate your product VS the competition and use the good parts for communicating the message. Amazing teams will also take the bad parts and bring them up to the product teams so they can confirm weak parts and put them in the queue to get looked at.

Marketing a bad product will only last so long.