I've never been crazy about Kuu's winter ballads, they all seem so similar and dry to me. Koishikute is nice but i forgot about it after 3 days.
Yume No Uta, You & Sukix3/Anata Dake Ga are great. Stay With Me & Ai Wo Tomenaide are passable at times, i don't really care for Moon Crying or.. yeah well, sadly Koishikute now too. I think Ai No Uta is the only one i dislike though
Mind that i still have to listen to her discography before Best Second Session, so there might be some gems there.