I was reading about the creation of mingle2.com, and what struck me as curious is that at that time (in 2007) the online dating market was well on its way to being saturated (aside from niche areas of the market). At the same time the site really did not offer anything that couldn't be found in the free or pay sites such as match.com or pof.com. The creator seems to have applied some very creative guerrilla marketing strategies that allowed the site to obtain a very high page rank on google.com.
With the above in mind, I really wonder whether the quality/idea of a web application really matters vs. the marketing effort put behind it. It seems that users will happily use an inferior product if it is marketed correctly and they can get to it easily.
So, the question is: why innovate within the web application arena, when the business that succeeds tends to be the one with the best marketing effort behind it. Am I wrong here? Have I made some unfounded assumptions?