Again, I understand the point of view, but just because Maxima can be a less-than-great person doesn't make her a bad love interest for the purpose of story. As I mentioned, she offers variety. Not every story has to feature totally wholesome and healthy relationships and characters, plus it shows that there is lots of room for characters to grow, which some readers would like to see. In Japanese anime and manga, the difficult and/or crazy woman appeal has developed into its own sort of category of characters with things like yandere and tsundere. So, there is an appeal to that sort of thing, depending on reader preferences...and of course, if the stories are good and convincing.