I rarely like Kajiura's piano or piano/strings only tracks. but:
HtA had tracks like Palpitation, Lost Piece, Awakeness, 君とひとつの夢を #2, 秘めごと and others. There are only so many piano tracks in HtA anyway.
but there are tracks like: 夢みること , 折れた翼, しいたげられて, completely filler tracks. Though even these sound good in the context of other tracks as you're listening through the cd. You are not alone variations are given one after another, and it's literally a few notes. I don't think one needs to be musical to see this (yet I don't claim any expertise here). Sure there are Madokaesque tracks in HtA but almost all those similar tracks had their own identity, imo.
I really try to be objective and it is difficult yes but my conclusion is that Kajiura did not work on SAO properly and frankly it's high time that this endeavor is over.