It usually takes me 1-2 days to finish a 24 episode anime. It took me 1 week to finish this anime. Ima give my opinion on what I thought of this anime.
I always like to begin with art first for my reviews since that is usually what I judge it on when I watch a series.
Art: It was GREAT until..........episode 10 and up. I don't know if it was just me or what, but the "basquash" and the ball bouncing got much slower and boring, the graphics got worse as it went on, and there were inconsistency in the drawings. I don't know if they got lazy or fed up with this anime and just threw a crap job at the end, but the art was painfully bad. It was painfully slow, their movements, and there were less ball bouncing. The character art was ok, but it got worse later on. The art was what caught my attention in the beginning with the mecha and the choreography of the mecha, but it got into such a slow paced choreography that it made no difference than watching the first BFB match that was played. All they did towards the end was add some shiny trails, and apparently was supposed to make the matches more exciting, but it wasn't really. (The fatty was still fat, and then all of a sudden skinny.........I laughed).
Sound: It was GREAT until................episode 15 or below, I forgot. The opening and ending was very catchy. I listened to both the opening and ending everytime I watched the anime. The background songs in the anime was also excellent, especially during some of the matches. It made my heart tingle and made me want more. Then it got worse...the sound, like the art, was getting pretty bad. I guess the 2nd opening was good, but the 2nd ending was only mediocre. The background music played later was horrible and at most times, very random. The timing was bad, and it doesn't seem as interesting. They even didn't bother to change the voice actor of Slasher when he turned young.
Character: Dan JD, lawlz. I laugh at him. I didn't like him in the beginning, and I still didn't like him til the very end. All the characters are very shallow, and there are no interesting characters (except for Iceman, gotta love him). They're art was the only good thing. I mean, if they just kept the "dunk mask" on Dan instead of the overly retarded looking blue helmet, I might of liked him a little bit more than I do now. The character relations are horrible too. We see "romance" (LOL) develop at the most random times. Also, I really didn't like Miyuki and Alan. They were pretty useless in this whole mess. The appearance of Navi was at most random. He didn't contribute much at all to the whole anime. If they wanted Sela to like someone, make her like Iceman Hotty.
Story: Lol. I actually would of preferred if this was just a regular sports anime where a boy just wants to go to the moon to heal his sister's legs so she can walk again and play basketball. The whole, Nike saving the world and earth and moon crashing and destroying the moon and playing basketball when the earth is being destroyed is as bit excessive. There were many cliche moments. I laughed at the RougexDan kiss scene. The storyline started going all over the place. I don't know how to explain this anime. I can't even write a review on this without being frustrated. There's so many things to talk about without spoiling a whole bunch of stuff. It was just bad, and I didn't like it. The relationship between Dan and Coco SHOULD have been the main focus of the storyline, but then they shifted to Dan and made him the legend. Starting at like episode 15, they kept saying legend, legend. It was repetitive and not to mention that I have no freaking idea what they were talking about. When I first heard it, I thought, was he gonna play basketball to save the world? I was right, unfortunately.
Enjoyment factor: I liked it until episode 9. Everything went downhill til then. The forced storylines and the forced relationships and the forced dialogues and actions all made this anime very unbearable to watch. When I first watched this, I was like, oh yea, this anime is getting a 8. But no, it's not. Alan was just annoying and a waste of screentime. They made us see her practice basketball, and she gets to use it maybe once in this whole anime. Her "hearings" are also annoying. Then towards the end. We see characters teleporting to different places. One second they're at the camp, the other they're at the gate. The fatty turns skinny, then fat again, then skinny in like 15 minutes of the anime. The ending didn't answer MANY QUESTIONS. I had a lot. WHY DID THEY NOT MAKE COCO AND DAN TALK TO EACH OTHER OR HAVE A MEETING. Instead, they showed Iceman and Dan playing basketball. Gotta be kidding me. And not to mention who Dan ends up with is unclear (although most people say it's Rouge).
TL;DR - THE FIRST 9 EPISODES WERE EXCELLENT. THE REST WERE HORRIBAD.