STORY: Those who have played the Visual Novel or watched "Phantom: Requiem for the Phantom" anime series will see that the base of the story is the same, but that "Phantom: The Animation" changed almost every scene. In addition, some plot developments are useless (Zwei being offered his memories back didnt't serve the plot at all), we know nothing about the organisation whom Ein and Zwei serve, not even its reason for existence or why they are opssesed with killing various mafia bosses and a guy called Scyhte Master is here literally a evil genius with his own base with badass monitors and his own personal army.
Also, Ein and Zwei are for some reason LITERALY superhuman. While they are supposed to be superior to other people, "Phantom: The Animation" crosses the border by leting them ALWAYS fight against armies of enemies and usually kill their opponents with clean headshots while running around.
ART: Art is ugly, characters often look different from scene to scene and camera angles that are used screw up the character designs more often then not.
SOUND: Soundtrack, OP song and ED song are nice to listen to and are probably teh only good thing in this anime
CHARACTERS: Both the Visual Novel and the TV series depend on characters, their developments and their life in their cruel world of crime and killing. "Phantom: The Animation" also tries to make good use of characters, but it fails. Their relationship develops suddenly, them becoming enemies is not dramatic at all and they seem like real souless characters about whom is hard to care.
ENJOJMENT: If you are not picky and like to watch gunfights, you may enjoj this anime. If you are interested in good plot or characters, then don't bother watching this as you will waste 90 minutes of your life.
OVERALL: Bad plot, lack of character development and badly executed story are just some of things that make this anime a bad one. If you like the premise, I suggest picking up either the Visual Novel called "Phantom of Inferno" (which has been translated) or watch the TV series "Phantom: Requiem for the Phantom" which is a much better execution of the same thing.
