Watched this anime a couple of weeks ago, without expecting really much from it. I was positively surprised however by the time that I had reached the end of the series I wasn't that impressed anymore.
The animation is a like or hate thing, however even if you hate it that's no reason not to watch it. I hated One Piece's animation and now I think of it as one of the greatest adventure animes ever made. What I liked about Akagi wasn't the story (which was plausible at best), nor really the mahjong aspect of it but instead the surroundings and characters that are portrayed in the series. The depiction of Japan during this time is quite captivating and some of the characters are original, well, by anime standards at least. But frankly put, I thought this anime could've been alot better.
I couldn't help but to get a bit boored by this show in the end, despite its many upsides. It was too long and at times the plausible parts of the story wasn't really even that.
I'd give it a 5/10, I'm sure that'll not go too well with some of you but that's how I feel.