Pithy, but I'd be interested in your thoughts on whether a great product is necessary but not sufficient, or simply not necessary. By "great product" here I ref

Pithy, but I'd be interested in your thoughts on whether a great product is necessary but not sufficient, or simply not necessary. By "great product" here I refer to one that solves a pain point--in other words, great in terms of the metric of customers willing to give you money rather than the metric of developers think it's cool. More succinctly: can a poor product succeed with good marketing? For the long term?