i think this is a double case of things
Ignorance is bliss; Casual gamers haven't PLAYED the top absolute best of the line. They don't realize when controls are being used badly, or when there are frustrating events that have been dealt with better in better games.
Video games are not life; Hardcore gamers play these games as a way of defeating the challenge of it, and to experience sound visuals and story. Casual gamers DO play games sometimes just 10 minutes to half an hour at a time, maybe 1 day out of a week, and don't want something complex that they have to make a part of their life. they WANT a simple stupid distraction.
So basically, teh first poster has it exactly right.