An another sport anime, if you don't like those type of anime pass away, Ahiru no Sora didn't revolutionize anything. But If you like this genre then give it a try.
I'll compare this anime in my review with Kuroko no Basket, same sport and popular anime.
Date of review : 22/12/19 (will probably make some edits further the anime advance)
Story : 7/10
A generic sport anime but not driving by the shonen spirit (for now).
Player's skills seems logical, contrary to Kuroko no Basket, and character's background is interesting, again in Kuroko the characters background is kind hollow (IMO !).
I find more interesting to follow the progress of a team, as a whole, because it make the story more coherent and it make the characters more lovable.
Need to mention that's the anime explain the rules of BASKET (!) when in Kuroko I didn't recall to read (I read the manga) or watch (and watch the anime) the rules explained. It's nothing but I appreciate the efforts to, at least, understand the depth of basketball (don't practice this sport lol).
Art : 6/10
As always in the first episode the animation is good, have been bait by this, but globally it's VERY average animation even during a match which is a pity. Unfortunately it didn't got the same budget as Kuroko no Basket. But well expect a way better animation in important matches.
Sound : 6/10
Not a fan of the OP and ED.
In the seiyuu part, even if I am a fan of Kaji Yuki, his dubbing is "okay-ish" not spectacular as Eren or Silver Mask (Arslan Senki) where he push his voice to the limit but his character don't give the oppurtunity to express himself so I feel a bit disappointed (not his fault but well, I'm conflicted).
For the other it's good, the voice match with the characters (yeah I minimize the others unlike Kaji Yuki... :X ).
Character : 7/10
As I wrote earlier, the character's background is interesting. The motivation to push them to play and train is coherent and understable (for the key players I precise).
As a whole they don't have any default, except some stereotypes but well I'll give a pass because it's not really annoying.
Enjoyment : 9/10
My shonen spirit who was more or less dead, because of the disappereance of good shonen have burst with this anime. I repeat nothing spectacular and because I starve some shonen energy I overestimate this anime but I am really enjoying watching this anime.
I have followed the last season around 10 animes (more at the beginning but dropped some in the way) and this one, was my most awaited each week.
Overall : 8/10
I give a 8 because of the story, the consistency of the characters and the shohen spirit (totally subjective point).
Cant give an higher score because of the weak point inherent of the animation which is low.
So I recommend it if you're neutral or like sport and the animation is not a mandatory point for you. Otherwise pass away.