What is far important the marketing campaign or product features when it convince consumers by it self because of its quality,price and rareness ?

Marketing campaign is no substitute to the product features, BUT the features in itself wont sell the products unless the consumer is made aware of these USPs. Thus marketing campaign must not be confused as an instrument only for pushing the sub standard product/service. Every product/service needs an effective and well thought out marketing campaign that can pitch the product's features in the targeted consumer's sphere, making them aware of it and relating their needs to the solution provided by the product/service.

all you said is crystal clear and so true MR.Abbhinav. the marketing campaign is a must for every product  launch and brand succes ,but my question is about the later stage ,when the product is in the market and the competition is high and fierce ,if the quality of the product is not up to the consumer expectations ,then it can't  stand the battle. right ? the marketing campaign is useless. so what do you think ?

why some brands and products continue in the market  without realising  their failure in infront  of other success .

i am the kind of person who will not present  any product to my consumers,i am not convinced of  in the first place ,i mean by that i believe in the saying ' the product sells it self by its  self 'if it has the upscaled features.

right ?