I want to make a question..
what is systme seller??
I though you were talking about really good games that can take the attention from a lot people..
Well the fact is that Assassins Creed Unity, Watchdigs or Driveclub aren't that greate but all of they pushed up the sells of the hardware... Hype is a capricious bitch!!
also many games sell for their trailers not for their final quality.. and we all know colorful games are percieved as a minor product compared to realistc ones.... something goes wrong on this world.. it's a shame