In a book I read recently, the main character meets a dude, falls madly in love, then the dude dies. We are supposed to be sad, but my thoughts were more along the lines of “oh well.”
It was not that the death itself was badly written, it was that all the relationship building with the main character was done in summary. We are told they trained together every night, but we were not there with them.
People need to remember that when you have relationship building moments between characters, it is also a relationship building moment for the reader. By summarizing all the relationship building moments, the readers never get the chance to build an opinion on the character. That leads to readers not really caring as much as we should when they character dies.