So here's my thought that I feel strongly about.

Harry Potter and Hermione should have been together! They would be the cutest couple. Ron and Hermione? Not so much. I think I would like Harry Potter better if Harry and Hermione got together. They have been best friends since they were children and they care about each other! I never thought Ron and Hermione are a cute couple, nor Harry and Ginny.
Harry ended up with the wrong girl. Does anyone agree with me?