Dudess...you are asking a really wrong question. If I had to ask all these people if they loved Twilight then they would squeal and faint. In my eyes I find Twilight a lot more horrible...but there are lots of similarity in the mangas and twilight. No offense meant, if you like it...then you like it. I got no right to tell you what to like and what not to like.
Now to the mangas by Shinjo Mayu...she's a perv, lol. Just as much as every other smut author out there. Have anyone read any smut manga where the girl wasn't forced...sorry 'raped' and then fall in love with the guy? Probably not!
I'm a male...and before people start bashing me for being male and having this 'kind' of opinion...I read H. In H we got rape too....and if I compare with rape from there and this 'rape'...sorry...the girl is raped in every manga? WTF!!! Someone need to show it to me cuz I read every manga of her and I didn't see rapes...(Haou airen or Kaikan Phrase..dunno long time since I read them...and never finished...). Oh btw I'm not saying anything liking rape hentai mangas...no I like cute love stories where 2 people have sex and love each other more and more and more and more...yes passionate love stories in my H, lol.
Now with Shinjo Mayu....She's cute...I have to say that she's one of the very few mangakas who's actually got a nice face to look at..ehem back to her mangas:
Her girls are usually stupid bimbos who doesn't know better and love to get in bed with famous guys.
Her guys are insecure guys who only plays smart and secure and trap the girl in their love so they won't lose her. Still they feel incredible insecure when a new guy comes in the picture or when they have to protect her from something....they show weakness...which girls like to see, bimbos too.
Her stories are....well at the start her stories were just the same all of them...no really. I still liked to read it but I'm not a huge fan of her. I like to read them in my free time when I got nothing better to read.
Then she released Ren'ai Strip which is my favorite of her titles. I loved it how the girl is a geek with classes and the guy who has been in love with her since he was small, tsundere! XD
Later she released Love Celeb which I liked too since it was different from her usual stuff....sadly like someone else pointed out...it lost it's touch and became her usual stuff. Atm I like her Ai wo Utau Yori Ore ni Oborero since the roles are kind of reversed...I haven't read it for some time since I've been quite busy with uni so...I hope it continues as before and hasn't lost it's touch. Btw it had rape too...well it was going to be rape if the chick wasn't saved. She would have been raped by her girl senpai, lol.
The title I would like to read from her stuff right now is probably Ayakashi Koi Emaki. Only the first chapter is scanned but it was interesting, it made me smile. Yometora seems to be interesting too from the cover, lol.
Lastly I want to answer the question as someone else pointing out: If you hate her mangas that much how come you know so much about her mangas?
Easy, they read it and love it but the officially they hate it, lol. They probably say the same about Ohmi Tomu mangas, lol. She did Midnight Secretary and Kindan no Koi-series.
The rest who doesn't really like it...it's probably because the males in this manga are possesive lovers...they don't like guys who try to posses you so you like for them and they for you. They need space and freedom!
...and now back to the exams, lol.