Very akin to Death Note, both series feature an intelligent young man, determined to change the world. However, I felt that the main protagonist of Code Geass was a lot more relate-able, and allowed for a deeper connection to Lelouch. Although the story does start off rather slow, it really gets its stride around episode 8, and doesn't let up making Lelouch's exploits very interesting to watch.
CLAMP's art designs can be quite frankly, unappealing. But after awhile, the animations grew on me, and now I like the design in the series. But even when I didn't like the character design. I had to admit the Knightmare Frames were pretty cool, and were well designed.
The voices were really well done, and Lelouch honestly just steals the show, kudos to Jun, for his voice work. Definitely one of the highlights of the show.
