SerpAttacks Difficult Rating. Accurate?

Hi all, I have been messing around with serpattacks the past few days, and I have found a few keywords that look promising. S.A. is saying the kw is moderately easy.....is this program accurate at all? Just seems like some of the top 10 results are kinda big boy sites. I have searched the forum and I have no found anything so if this has been asked before I apologize.