I suppose it depends on my mood, but I've seen both types done quite well, and I've come back to both types after beating them. Plus there's "in-between" mods where some things are changed but not others. So, where exactly would you draw the line, and what would compel you to keep that line in place? I just simply wouldn't draw the line anywhere. I say - if it's done well, and it's enjoyable, then I'm all for it.