Let me review this:
Story: 9
The story is dark and is little bit complicated. But its fast paced and really works out well. The back story of L and Light is not much told but it doesn't take the fun away. But still the story goes a little bit downhill after certain events, which in my thought could have been avoided by the creators. Over all its Good!
Art: 10
The art is just awesome for a 2007 anime.
Sound: 10
The theme song, L's theme, Light's theme, all are amazing, with awesome guitar work and synths!
Enjoyment: 10
YOU WILL NOT REGRET WATCHING IT.
Overall: 10
Its a must watch anime