Moar quotes! ( I know I should write something myself but this also was just too good!)
If you have a quality product, you put it on display at gaming conventions and allow people to play it. You have open betas. You allow the “gaming press” to sit down and actually play it rather than plop them in front of guided tour videos. Heck, even if you don’t want people to just play and find out for themselves how good the game is, you at least release lengthy (8-10 minute) gameplay videos.
If you don’t have a quality product, you keep as many details as possible to yourself and focus on marketing tricks.
Gee, I wonder which game this might be applicable to?