I love this series. Combining the giant robot international-scale (and sometimes beyond) wars of Gundam with the knife-twistingly painful process of watching the series "protagonist" make decisions that either directly or indirectly devastate or end innocent lives (from outright murder to the destruction of property that happens to contain innocent people) which one could easily find watching Death Note. Of course, there's the added bonus that while deceitful, conniving, and more than a little self-serving, Lelouch is repentant and remorseful of his sins, a trait he does not have in common with Death Note "protagonist" Light Yagami. Were the two to duel one another, I would root for Lelouch.

I can't get enough of this series despite the fact the lengthy saga has come to a satisfying end at least in the anime in my opinion. I haven't read the manga. But I would read the Nightmare of Nunnally if I could find it. I used mangafox to read the entire Psyren series, but Nightmare of Nunally is licensed thus it is unavailable. But the concept of the series is so intriguing, I hope and pray it'll become an anime of its own.