Does it suck? or did marketing efforts failed?

[givenstage]

Hi all,

To me, not all popular / famous games with millions of players are good games. Not all games that failed and vanished into a dark corner of the App Store are bad games as well... I always believe that an average game with super effective marketing would always outdo a great game with bad marketing, if you would agree?

My question is, when a game isn't doing well, how do you tell if your marketing efforts are not working, or is it the fact that your game sucks?

(This also adds a sub question I had in mind, when do you continue to update and improve a game that isn't doing well, and when do you decide to move on?)