The name sounds really cheesy, sounds like the Justice League posing with the wind blowing beneath their capes. It's not that.
It's actually a very enjoyable and satisfying animated movie and only 75 minutes long. The movie has an epic feeling in it towards the end and it doesn't disappoint (if you prefer realism even in your fantasy). The animation is very good and as a side note it looks to be completely done by Koreans, even though its backed by Warner Brothers and DC. I would say that this version of Superman easily beats the revamped movie with live actors that came out a few years ago, as well as the animated rendition of Superman Doomsday, and the last episodes of Superman the animated Series and Justice League Unlimited.
What really makes it great is that Superman is dying throughout most of the movie. This occurs within a few minutes after the movie starts, so I'm not giving too much away there. Superman is just so noble, so it's really touching watching him live out his last day of life. I think him dying (not in a sick bed) but like having one day left of life is what really makes the story so interesting. Lex Luthor proves himself to be a very worthy adversary to Superman and Superman proves himself to be not just all muscle, but very wise and clever too. There was one other thing which I noticed the second time around: which is how the beginning of the movie starts off with Luthor saying how much he hates Superman because his greatness diminishes Luthor by comparison (Luthor is incredibly vain) and all these great things would have been possible without Superman. This actually seems somewhat plausible half way through the movie, but in the end you see how full of shit he is and it's done in a fairly clever way.
Nonetheless, it's still Superman's nobility, imminent demise (or will he live?), epic fights, superb animation, great voice acting and fairly good music which make this such a great movie, and dare I say even moving.
If I have any complaints it would be that the pair of bad guy Kryptonians who show up does not have a sufficient fight and the movie could have used one more good Super-brawl. I don't know who from, maybe Dark Adam, or maybe a quick ass-wuppin' on Brainiac, or maybe a big fight with Doomsday with some elements of the Justice League thrown in for the assist (as it was in the comic). It would have to be a worthy foe for Superman and tied in to the plot.
* High Quality Animation
* Luthor is a worthy adversary in this one and Superman shows off more than muscle
* Epic feeling that doesn't disappoint
* Perhaps a bit too many villains, some of which are defeated without any effort by Superman, perhaps fewer villains but more developed would have been better
4/5 (Somewhat biased here considering that I love the Justice League and animation in general)