My sister is a manga collector.. or at least she has TONS of manga in our house and when I'm bored I ended up reading some of the books.. However, it seems like most of the books I chose to read at random has a similar story / character personality and ending..
1. Girl always gets the boy.
No matter how stupid / "ugly" / silly / mean / uninterested the girl is or no matter how anti-girl / uninterested / anti-social the guy is, the girl for whatever reason, always gets the guy.. No matter if the guy is engaged, or married.. somehow, the guy would end up falling for her.
If the guy is one of those loners, the girl would always "charm" the guy and be something different so that the guy will fall in love with her. Even if the guy is a common playboy and the girl is the exact opposite of his type, he would end up liking her and stop being playboy.
It comes to the point that the story becomes stupid that EVERY MALE CHARACTER falls in love with the main girl (if the story has multiple guy characters) even if the other guy was only pretending to be a rival.
2. Guys have stupid reasons not to be with her.
I once read a manga where the guy decides not to be with the main girl (that likes him so much she follows him around like a stalker yet it's considered sweet and cute because.. y'know it's a manga) because he wasn't able to "protect her". He came to that conclusion because she was kissed by another guy -- which was her own fault for wanting to follow him to a middle of an all boys dormitory -- and this, of course hurts the girl's heart etc.. and when confronted, he just said that he couldn't protect her and that she found another protector that is better than him (who is the guy that kissed her in the first place.) WTH!?
Usually, guys rejects the girl because they think they're not good enough for the girl.. it's a common reason.. which is stupid. If they think they're horrible then .. stop feeding her love soul and move away or something (which is probably a stupid solution but I was pretty pissed at the guy being all nice to the girl in the first place anyway). I mean, you never know if you're perfect for each other or not if you don't try, right? And it's not like good relationships means zero problems. Fighting is common in relationships, just learn how to deal with them properly.
3. The guy is always smart / hot / attractive.
Even if the main guy is a glasses nerd looking man, he'd be portrayed as a cute boy and would still get votes from girls. Unless it's a boy manga, I've never seen a chubby guy that gets chased around by lots of girl.. I mean, I've read a few short romance stories.. but then sometimes they end up being skinny in the end..
The girls are also pretty much skinny and proportional.. there are that are slightly chubby but not super obese and even if they are obese, they will try to diet.
4. Debts is cleared by engagement.
When the girl is deep in her debt, suddenly out of nowhere, she is now engaged to this rich young man and her debt is cleared! Sometimes she has no other choice, and sometimes her parents are the ones that insisted.. Of course the guy isn't interested in her because she's still a "kid" or not sexy enough to be taken advantage of.. and for some reason, this pisses off the girl because in the end, despite hating him, she'll fall in love with him. Surprise!
5. Overused personality.
Typically, the girl is always the bubbly type.. or she's a clutz.. often gets her skirt hiked up by the guy and gets all embarrassed yet she's cool about chasing the guy all around. Or the girl is quiet and gets misunderstood by the people but she's able to open up to this one guy and they end up falling in love, she gets stronger with his help and be more confident etc..
If the guy is bubbly, the girl is usually anti-social and the guy will drag her into doing silly things that'll open up her heart and make her see how fun the world can be..
If the guy is anti-social, it's somewhat the other way around.. and the guy will be paired with a clutz girl.
6. Over-reacting!
Girl characters often have stupid reasons to be heartbroken by their past.
They were rejected because they were ugly -- so they do a 180 personality and look change yet still scarred by the memory when she sees the rejecting guy..
They were double played by a playboy -- so they don't trust guys anymore, or they hurt guys and gets revenge.
They often misunderstood situation and end up thinking that the guy cheated on her / likes another girl just by seeing him walking with another girl. How shallow / stupid can they be?! Do they really not trust the guy that they'll run away and cry after seeing such a horrible scene. "Why is he together with that girl?" Well, she's his sister. Or they work together. Stop being stupid!
And sometimes they're not even together! She just has a crush on him so she gets heartbroken since all this time, she thinks he belongs to her. Well, no! You haven't confessed to him so why the hell do you think you're the only special one?
Of course, the guy will then clear up the whole mess and confess that he actually likes her too, etc, happy ending.
See, these overreacting is what caused people to kill themselves over a break-up or cheating bf/gf. It's not worth it and mangas aren't teaching any different. Nor movies. Nor media.
Overall, there are still a few good romance manga with an interesting plot: Kare Kano, Beyond the Blindfold, (and if you're into classic manga) Pop corn, etc. Some even have a fantasy theme to it like From Far Away.
With the price of manga going up compared to the old days, why isn't the quality of the stories increasing either? It seems a waste to buy a manga that has a predictable ending where the girl gets the guy.