I like Joey as a schoolgirl in Tyrol. Although some of the ‘sensitivity’ is over played, she’s not presented as a paragon and she’s lively and fun.
It’s the fact that her development is kinda arrested after that that gets me. Elinor couldn’t bear to let her go so she’s a grown woman trapped in this schoolgirl world, howling at the middles, writing books about it, hanging out with the trips. It’s just odd.
Marylou I struggle with even more. The sturdy little girl we first meet is fine, but the obvious authorial favouritism (I’m still not over her being the one and only ‘head of the middles’) is nauseating.
Plus on a personal level, I don’t find any of her supposed good qualities remotely attractive. The bossiness, constant interfering, piety are all massive turn offs.
I loved CS Grow Up because I felt massively vindicated in my dislike of her. 
And then Len is dull as ditchwater.
Yet she wrote so many attractive characters who I loved despite (or perhaps because) not being top dogs. Margia, Corney, Evvy, Biddy, Gay, Tom, Daisy, Gwensi, Julie, Vi, Bride, Josette, Con, Jane.
Too emotionally involved in her heroines I guess.