I'm used to reading about the american upper class, where arranged marriages are very uncommon/practically non-existent these days. And I have to imagine it's a lot less common in Japan than these VNs would lead us to believe.
But the realism isn't the issue. I just get really mad when a heroine is having their lives dictated by others down to something as huge as marriage and they just accept it. I suppose I should then like these stories because they obviously always end with the heroines going with the protagonist instead of their pre-arranged partner, but there's invariably major plot points along the way that piss me off.