Total agreememnt on Light's killing spree of the police. Onto Light's morality, ('cos now that you mention it, the whole issue is kinda interesting) I think that before the mass killilng of the police, Kira had some form of morality that while might not have followed the Law, it did follow a form of 'human' Justice along the lines of 'an eye for an eye.' However, it is pretty obvious that after killing of the police the mroality became a highly personalised (and manipulated thing) because Light, as you pointed out, is all about power for power's sake.

Curiousity is a huge motivating factor, and I think L, at first, would use the DN purely from a scientific POV. Afteraward it would be a question of whether L has enough will power and sense to realise that the DN is too tempting, too dangerous for any human to weild. I'm in agreement with you that L respect the Law too much to step beyond the bounds of it (too much anyway), and to a certain extend the maturity would dull a bit of any megalomaniac tendencies (you'd hope), but when it is all said and done it is all dependent on L giving up the DN. Which I think he would because as you pointed out, different roads to achieve Justice.

Misamisa!! Much love! No, no, no, I think you are right. I do think Misa will stay on her own side throughout most of the series! But I so want her to have a purpose, and considering DN is all about head games and using things to achieve goals I really hope they make use of Misa. And thank the gods she's not another Sakura. As for the disappointing portrayal of women... I have come to the realisation that Japan, as culture, like dumb women (innocent, naive, you can pretty it up however much you want to but when it comes down to it the whole thing is about damsels in distress, and the purity thing put my teeth on edge.) And I shall stop now, 'cos women in anime/manga is a huge ranitng point for me and if I ever start it properly I don't mean to stop for a very long time.