O/A is a series which sets out to be funny and ends up having several heartwarming moments on the way. It's a strange sort of page-turner where I started out having low expectations but couldn't stop reading for reasons unknown to myself. As the series continued, however, I realized that the characters were a lot more than the cardboard cutouts I originally thought them to be. They weren't completely believable, more caricatures than anything, but they were all immensely interesting and entertaining to watch.
And, in the end, that's what really sold me on O/A: the characters.
As a comedy, it tends to fall flat every so often (and those poop jokes are starting to get funny again by the sheer virtue of being so absolutely overdone). As a look into the idol industry, it's certainly a very seinen-ized and comedized version of it. And, even as a character study, it's certainly not on par with the greats (or even the very goods).
But, somehow, it works. And, while it might not be a fantastic, eye-dropping, life-changing work, it certainly is an enjoyable one.