User blog comment:Commdor/E3 Coverage of ME3 News Begins/@comment-1596833-20110609222603/@comment-4051983-20110610025322

Nihlus was only needed in ME1 to display just how deceitful Saren was, being shot in the back by his former-mentor and all. Besides that, he isn't very integrel to the story or Shepard's development as a character.