The Art in this anime is great and the action scenes are really well done and fun to watch. You can tell they put a lot of time into animating it well.
The sound is good nothing I immediately noticed, and the openings are okay but what does stand out is the soundtrack is very well done. At times it can be emotional and at times very epic.
The Characters are very good and all have their well thought back stories.
There is a lot of enjoyment to be had in this anime especially if you watch the second installment.
The story is well planned out but at the end of this part of the anime you have more questions than anything else. Another thing is that somethings in the anime are not very believable. For instance how such a controlling state does not have better surveillance and doesn't pour barely any resources into finding out who Zero is. The amount that Lelouch gets away with in the beginning is a little far fetched. Another point that is a little lacking in this anime is that a lot of times they don't show you how Lelouch really does his genius they just kind of tell you he is super smart and your supposed to believe him. Most of the time they don't really go too in depth into his plans, whereas in Deathnote we saw Kira's plan every step of the way and exactly how he did it.
Overall this anime is really enjoyable but has a few flaws, but has a huge pay off at the end if you watch it all. The pay off is arguably much better than Deathnote's.
