I have heard a lot of people say and believe that "if your product or service is good, it would sell itself". That's not entirely true.
No matter how good your product/services are, if people don't know about it or are not willing to patronize you, then you will have no customers or clients.
Some companies sell water and market it so well to the extent that people believe it is more nutritional than normal clean water when in fact it may just be water.
Speaking about companies marketing their product very well that make some individual to begin feeling like they're using the best product reminds me of Prime energy drinks. I have tasted that drink and it's not as good as they're marketing it still they're getting good feedback as they're now the official partners of Barcelona football club, last season they were partners with Arsenal and the drink isn't old in the industry but they market it so well.
If your product isn't marketed very well, you'll lose customer to your competition that their product isn't as good as yours. For example, Samsung produced more quality phones than Apple but because Apple has marketed their brand very well, it has made it more popular.