Advertising can be good if it becomes entirely honest and selfless. This never happens. The actual social analogue of this is known as "personal recommendation".

As soon as you're paid to inform me about a product, and you subjectively promote that product's virtues over their competitor's virtues, you've become at best untrustworthy, and at worst manipulative. You may be correct in your statements, but, because you gain financially from those statements, you can't be 100% trusted.

This is just the way of the world. I'm sorry you may feel otherwise.