If you are a fan or gundam seed or death note or both, I guarantee you would love this anime.
Story: At first I thought that this anime was going to be boring because of the first few minutes of the beginning. After watching the first episode I was really amazed that what happened. It's very much like death note + gundam seed because It fallows a same goal as death note. Why gundam seed some people ask?. As I said before this anime is like death note + gundam seed. There are robots/mechs like in seed but they don't really look too detailed until suzuka got his new knightmare (gundam/robot/mech thingy). I found it cool that they called it "knightmare". The story itself is amazing and there Is an second season coming.
Sound: All I can say is excellent and pretty detailed.
Characters: Most of the characters look pretty good and very well made/drawn (not sure if thats a word o.o). Well it's not really a downside but most the characters In code geass never really changes cloths much and always wear the same thing.
I am looking forward for season 2 and I bet you are if you start watching CODE GEASS. Code geass FTW!! (for the win).