User blog comment:Mexican215/So who was satisfied with the last battle against the Reapers?/@comment-1440333-20130206003045

An end boss of some kind - like the proposed battle against Illusive Man - may have been more satisfying from a gameplay perspective, but not a story one.

With the story being told a final boss just wouldn't have worked. I mean who would you fight? and where? when? how would you have fit the story around it? It couldn't work.