Madrigal is fantastic, didn't really get into it when I had it on mp3. But loved it from start to finish since I've purchased it. CAROL on the other hand, I just couldn't really get into and have found it dull, save for 'ELEGANCE'.
As for 'Something Blue', I find it very overrated. It's nice, but for one of her darker sounding albums, I thought Yoake Mae offered so much more in terms of arrangement and songwriting.
I agree with pretty much everything you said here (except I don't like elegance!) Madrigal is indeed fantastic, and I also find something blue to be overrated. I prefer yoake mae as well.
as far as b-sides go, my favourites are ぼくのともだち and そして僕は途方に暮れる (from Cherry Cherry), 恋はみずいろ (from Crazy for you), 星のラブレター (from TROPHY), LULU (from ボクにうつして), and X'mas Spirit! (from ボクのことを知って).