We've said negative stuff about her because she kinda deserved it at the time. If she is really serious about Mask-Senpai and want to change her behavior then i'm ok with that. Same for Shizuka, lately i don't see anyone really praising her because of her behavior,she seem jealous that Kaoru found someone other than her that she truly love and begin to neglect Mio, even to the point here of not trusting Mio's love by saying that the date was "kinda a forceful invitation". Mio has proven time and time she is head over heel Shizuka when Shizuka lately has been more worried about Kaoru than her realtion with Mio, proven that she don't see her realtion as serious.
Of course me too i don't want Mio to forgive her easily and i want Shizuka to really get her shit together and realise there is someone who really love her and she had hurt her because of her actions. I secretely want Mio to ask to break up just to put Shizukaon the edge.