I can't even tell who is singing what in Yarakai Heart, I think that is the biggest letdown, and not necessarily anything to do with the song itself. I guess that's how AKB vocals sounds like, I think Idoling should emphasize their vocal strength in their songs like they have been doing, otherwise they would be losing one of their identities.
Putting in Korean lyrics into Queen Bee seems like a bad move, I can't really see the fans in Japan liking that. It's just a B-side song though so shouldn't be too much of an issue.
The other B-side executes a little better in terms of solo vocals, but it does sound generic as well, as soon as I heard it the first time it reminded me of a Zard song.
Overall, this single is a very weak effort, there's usually at least one song in a single I tend to like, but this time, there's none. I think Idoling is seriously having an identity crisis, and steering off course by mimicking AKB too much.