I've been in spirited conversations arguing that Nunally is being used to a degree, and generally find Lelouch more interesting than Suzaku, but I agree with the OP on pretty much all points. For a non-Death Note point of comparison, maybe the title character of Gankutsuou/The Count of Monte Cristo? Like Lelouch, he's motivated by revenge, ruthless in its pursuit, a cold-blooded murderer and schemer, wrong by most any objective standard -- and still fascinating.
ETA: A friend also suggested Sweeney Todd in the same vein, although I'm actually the one person on LJ who isn't familiar with the musical OR the movie. ^^;
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ETA: A friend also suggested Sweeney Todd in the same vein, although I'm actually the one person on LJ who isn't familiar with the musical OR the movie. ^^;