Perfect Girl Evolution is absolutely amazing.
Sure it's slow, but it's hilarious to watch how dumb the romances progress, and the pace totally matches the characters' personalities.
Maybe it's full of bishies, but that's part of the humor; the attitudes of the perfect school idols when they get home, is humorous juxtaposition.
Sure the main character appears as a deformed pudgy thing, 90 percent of the time, but it makes the 10 percent that much more dramatic.
Maybe it is repetitive, but it is always entertaining how the author comes up with new ways to turn Sunako into a lady, then cleverly snatches it away.
Sure the characters are mostly static, but that's because the change in them occurs out of the story line, like what we see in the random flashback chapters, and they do develp. slowly but surely, Ranamaru is slipping out of his playboy ways, Yuki is becoming more respectable, Takenaga has pulled his nose out of a book for once, and the 2 main have developed a cute relationship, understanding each other more than anyone else in the series.
Maybe you see cheap laughs, but I find it a humorous plot line full of silly mistakes, weird scruples, and constant entertainment.
And so what if it's sooooo long? are you telling me you enjoy it when a manga ends? I feel so empty once a manga I've been following for years ends. I always wish there could be more, so Wallflower makes me very happy.
I have personally read the series 4 times, re-reading ii while waiting for the next book to update, and I never get tired of it. I guess that means I'm easily entertained, but The Wallflower always leaves me with a happy feeling. You can't be glum after a good old fashioned trial and failure of the 4 boys turning Sunako into a lady. So that's my take on it. It has some silly faults, but the faults that turn some away are the same characteristics that drew and kept me into the series.