What's not to understand? You've seen that Metal Slug RGB filter screen? If you have the option to play it like that, or play it like this:
http://i54.tinypic.com/23kuc3.jpg[/IMG
or this:
[IMG]http://i51.tinypic.com/jhf2oy.jpg[/IMG
Either of these is what your LCD monitor would upscale it to if you just stretch it into full screen, so why wouldn't you want to play it with that RGB filter instead? It makes it look a lot more natural and, less eye searing (or nauseatingly blurry like in second example)
It's not like anyone's saying they hate modern 3D graphics or anything, it's simply wanting to make the old games look less crappy on today's monitors.[/QUOTE]
This is why I own a CRT:
[img]http://dl.dropbox.com/u/3496710/AP/metalslug.png
The colors don't look that washed out in person, but you get the idea.