I started watching this anime, giving it a starting 6/10. I was up to a 9/10 within the first 7 episodes. Does that say something?
I am pleased to say that it says a lot. Casshern Sins is what looks like the most original anime of the Spring 2008 lineup, and while it may be sad, it is truly amazing to watch. (This review will update as the series goes on, if all goes well ;D)
STORY: 9/10
Casshern does not know if he is a man, robot, or neither. In a world of destruction, where humans are rarely found and the last of the robots rust, Casshern wanders, trying to discover his true self. If you exclude the amnesia cliche, the story is very original and engaging. You feel Casshern's emotions, you feel that somehow he has changed throughout his unknown ordeal, and you feel his sadness and frustration at his inability to control his primal instincts. As he wanders, he encounters many new things, all of which get him closer to discovering the truth of his world. The pace is somewhat slow in the beginning, but it gets quicker and stays generally understandable.
ART: 10/10
This is where Casshern Sins truly shines. The animation is amazing to watch, it's fluid, smooth, and elegant. The battle scenes are works of art, and it seems like the animation staff is always excited to draw new panels instead of reusing the old ones again and again. The landscapes look fabulous, and draw the viewer deeper into the sadness and depression in Casshern. Everything is drawn and animated beautifully; this series is almost a must see just for the animation. The best part is that 11 episodes into the anime, the animation crew still has not cut any slack on this wonderful series.
SOUND: 8/10
The theme song is pretty good, the ending is also above average. Nothing super superb here, but the music is engaging enough to draw you into the anime and feel the emotions of the characters. The ED is a "hopeful" song, one that leaves you with the right emotion instead of destroying the ending mood with a happy go lucky ero ero ending... just what we don't need. Luckily Casshern Sins doesn't do this, and the background music is above average as well. Nothing super special here, but its definitely not bad.
CHARACTER: 9/10
Casshern is somewhat cliche in his amnesia-but-wanting-to-do-good act, but it definitely works well for this anime. The characers around him are very unique as well, and all of them have some sadness that they share with Casshern and different ambitions. The way the characters interact is very realistic, and there's not so many characters that you start getting confused. Casshern Sins does a good job of introducing the characters and letting you get to know them well.
ENJOYMENT/OVERALL: 9/10
Promising series from what I have seen so far. I definitely reccomend checking Casshern Sins out if you're looking for something unique. It is a somewhat depressing anime at times, but it is meant to be saddening, so make sure that you watch something lighthearted afterwards. Unless you absolutely love the plot and characters, in which case I've done my job well :) I suggest you give this one a shot; you may find something you really like.