It should be pretty obvious that using a driving simulator on a home pc isn't going to help anybody pass their driving test quicker, so it continues to amaze me that people think that a home pc with MS Flitesim is of any value. Sims on the pc are a game. They are for entertainment, end of story.
An earlier poster (apparently with relevant experience) says that professional SIMs even don't work well enough for basic visual flight training. I concur with this view, having tried to use more sophisticated Sims than you get at home to do that. Key things that you need visually just aren't there - like the ability to judge the height above the ground in the final stages of the landing.