Board Thread:FAQs/@comment-26395021-20150519000208/@comment-25396609-20150519033549

Because the model 3's were mass produced. lower quality higher quantity, with the quality deficit being just enough to give her the advantage. model 4's are barely augmented at all, they have better training (spartan training on top of millitary field experience) but are otherwise inferior to the 2's or 3's because they lack the indoctrination and purely millitant mindset of the earlier spartans.