I've seen a lot of overrated and over-hyped animes here, but this has to be one of the few who's underrated, and one that should really be in the Top10 of Top100.
Strange but this anime seems to be the only one that all the people who rated it liked and respect it, even the ones that gave it an average 7 think this is a really good anime, but just gets dragged down by animation and the really depressive story, in their opinion, i happen to like the animation and the story.
This anime has one visible flaw but the good points more than make up for it. The only flaw i can see, and the one that drove people off from this anime even before they gave it a chance is the animation that looks like it came out of the early-mid 90's. Sure the fighting scenes don't look so spectacular and there are no majors CG effects, but the animation is still capable of inflicting a few WOOWWs and i find the space battles more intriguing from the logic and realism point of view a lot better than in Gundam, and if you'll watch the show you'll know what i mean.
The character design is that semi-realistic mid 90's Evangelion like style, no pink or blue hair, just the realistic colors you'll find in humans, Aeris Blue doesn't count since he has dyed hair. So overall i love the way they are drawn.
The sound is great, with nice music beats, even dough i didn't enjoy the OP theme to much, but i can't think of giving it a lower grade than 10 when it comes to voice acting. It has the best voice acting i ever came across, with voices so diverse and acting so realistic in all sorts of situation, from happiness, to anger, cry or desperation.
The plot is good and filled with nice and unpredictable twists and similar to the classic "Lord of the flies" but placed in a sf ground, so it's all about how a few hundred teenagers without adults to watch over them fight to survive. And belive me, the outside enemy isn't their own enemy, they are their worst enemy and as time passes things become more and more violent and desperate and the mood darker and darker.
So overall the story focuses on the human nature, on how people act in desperate situation and how these situations change their personalities, the fight for survival and acts of alliances, violence, backstabbing, emotions of all kinds from love, friendship to fear, hate, jealousy and self conservation. All put in an overall realistic and very detailed manner and very dark and dramatic that just keeps you wanting more. And this anime has a real ending, and i don't mean the short, forced conclusion, no, a hole episode in which you can see the aftermath of "no spoilers" the story, unlike most of the japanese animes.
The character development has to be the crown jewel of this anime, it has the best, most extensive and unexpected character development I ever seen. All the characters are taken care of, some are important from day one others that you'll never consider get a big importance after a while. I should warn you that there are about 26 characters that appear in every episode and have a real development, and that you might not like any of them in the end, but almost all change and at the end you'll never recognize them and you'll probably say "i never thought that he'll end up this way". Maybe you'll love some characters at first and then come to dislike then and the other way around.
Value and enjoyment:
This is one of the best, if not the best animes i've seen, and if you don't mind the animation you'll find a masterpiece of a story development, voice acting and character development...these are the three areas in which this anime could be the best of the best animes.
If you are a SF/psychology fan and you prefer story and character quality over animation quality then this is the BEST choice for you, but if you are a shallow person who just enjoys explosions and cool mechas and pantie shots then you better thing twice.
It is such a brilliant anime and yet so few people know of it, and why you ask? ... Well i guess this world is composed of shallow pantie shot, mega-exposion loverz since this show is so unknown and shows like DearS, Naruto or other top100 animes are soo famous.