Mmm... first I should explain why I chose to do Hinako last before the true route.  Hinako is the secondary protagonist of the VN, the one who introduces you to the characters as well as to the nature of the rehabilitation plan in the story.  As a result, Hinako's character development is jump-started, to the point where she is incomparably developed compared to Ruka and Momo. 

Hinako is probably the strongest person in the VN, at heart.  Of course, she has her - rather obvious - weak points, primarily due to her lack of social experience.  However, she is also a big-hearted young woman with a strong sense of compassion and love for others.  As a result, it is rather easy to get to like her, and it was tempting to do her path first as a result.

Her path, like Momo's and Ruka's, is short and inconclusive (for reasons that become apparent after you finish Ai's path) in the sense that very little is revealed save for Millia's origins and her relationship to Hinako.  I honestly was touched by that particular set of revelations, though the path itself was pathetically stunted, just like the others.

Ai's path is just the reverse... you get to discover Tsukasa's true past, the origins of the difficulty that pops its head up in the other paths, and... it is basically a standard true path, lol.  To be honest, I actually liked Tsukasa's character development in this path, since it is deliberately neglected and/or stunted in the others.  However, if you were to ask me based on this path whether I would name this VN a 'true great', I'd have to say no, unequivocally.  It is a good path... but it stops there.  There is too much infodumping toward the end, especially.