Let me be frank here. I didn't buy this expecting great songs or great singing. In fact, it was purely a fan gesture. You could almost say that I bought it as a fan of Asahina Mikuru, but that's not quite 100% true either because I like other characters she played, too.
It turned out to be better than I expected. I'm not going to go out of my way to recommend this to anyone, but if you're a big fan of her and are avoiding buying this just because you're afraid of it being a terrible album, I don't think you need to worry.