cloudtap - 4:00 pm on Jan 11, 2011 (gmt 0)
Well, QS is a way for Google to make more money, increase clicks as well as keep users. It is used as a competitive advantage and also is used in order to determine relevancy which is a huge factors and must be optimized throughout all processes.
I'd say QS is a definite difficulty for advertisers but it's a necessity and SO powerful for you if you have high QSs throughout your campaign - you can beat out all competition quite quickly.
QS = tedious AdWords management but it's cool