There are few things as satisfying as a properly made, hot of the pan, grilled cheese sandwich. Anybody can make a fantastic grilled cheese, but not everybody does. Perhaps because it is so easy, many home cooks get complacent because it is so easy and manage to mess it up by not putting any thought into it at all, while others ruin them by overthinking, kind of like the reasons good golfers miss two foot putts.
Those who don’t put enough thought and effort into a grilled cheese throw a slice of processed cheese in between the bread, which is absolutely inexcusable. Aside from the fact you should not have processed cheese in your house in the first place, if you can’t take one minute to grate a handful of cheddar you are simply too lazy to ever been a respectable home cook.
On the other end of the spectrum people feel like a plain grilled cheese is beneath them and make the classic mistake of trying to improve upon perfection and ruin it by using real butter or whole grain bread. If you want to impress people with your cooking ability then make beef wellington. When it comes to grilled cheese sandwiches, stick with what works. If you absolutely have to put some kind of personal touch then add a sprinkle of Monterrey jack with your cheddar.