FireLance
Legend
It all depends on what your definition of "make sure" is. 
The most basic step - which even the article agrees with - is to ensure that an environment in which everyone could have fun is created.
Beyond that - whether you choose to tailor the adventure or even your DM style to the players' tastes, or whether you decide to pre-determine or override die rolls in order to create situations and outcomes which you believe will be more enjoyable for the players - is a matter of personal taste.
I do agree that the DM shouldn't necessarily feel that he is at fault when one or more players aren't enjoying his games. However, that shouldn't stop him from trying his best (within reasonable limits which again would vary from DM to DM) from helping the player(s) to have as much fun as possible, nor should it stop him from reflecting on how he could have handled his session better in order to improve his DMing skills and approach.

The most basic step - which even the article agrees with - is to ensure that an environment in which everyone could have fun is created.
Beyond that - whether you choose to tailor the adventure or even your DM style to the players' tastes, or whether you decide to pre-determine or override die rolls in order to create situations and outcomes which you believe will be more enjoyable for the players - is a matter of personal taste.
I do agree that the DM shouldn't necessarily feel that he is at fault when one or more players aren't enjoying his games. However, that shouldn't stop him from trying his best (within reasonable limits which again would vary from DM to DM) from helping the player(s) to have as much fun as possible, nor should it stop him from reflecting on how he could have handled his session better in order to improve his DMing skills and approach.