Don't know much about IM@S in person. But its a few hardcore Love Live fans on campus at my college. And when I even mention IM@S they literally talk about how its trash and not worth mentioning.
The few times they have elaborated on it they say the characters have no depth and you don't get much interaction and "essence" with them. And they don't flesh anything out all franchise long. *shrugs* I can see where they are coming from maybe.
That said I don't mention anthing iM@S anymore lol
Oh man, you don't want to mess with Love Live fans, they're in a world of their own.
That whole thing about "essence", you really don't want to know what they mean by that.
Let's just say it's the kind of content that'll likely get you banned from GAF.