|Personally, I don't really have a problem with this. I even contributed to the story, and enjoyed reading through some of the stories others had written... I just encountered one problem that really rubbed me the wrong way...
Chapter 17: NO MORE CHOICES!
Look, I get why it was done, and I'm not going to say it ruins the story, but I do see some problems with that addition that I think could probably be easily fixed in some ways. For one, perhaps you could make it a rule that if people add the option of another anime, they'd need to legitimately add to it, deleting that option if they don't in a certain amount of time? Just an idea, and of course it's up to you.
The main reason this upset me was just simply because I haven't seen many of the anime listed as options, maybe about three or four of them, and wanted to add one I've seen and add to it as well.
But overall, that was the only issue I had with this, and it isn't one that ruins the whole thing. It's not a bad interactive by any means.