Like so many good mangas this had the potential to be great. It loses out to it's story by the end of the series.
Rin! is about a young man who chases his dream of becoming a mangaka. It shows him from the beginning of his trial and briefly shows the aftermath of him chasing his dreams.
Art: It's good and you can tell that this is from the author who made Beck.
Story: It was interesting in the beginning but as we begin to come to final arc of the series it leaves you frustrated. The romance isn't develop quite how I would like it to have been. There's no certainty in the romance which is a bit similar to Beck in that regard.
This is a good manga for any artist and writer who are interested in working in comics/manga or people chasing their dreams.