I am considering getting proph and factions while the offer is on, as I already have NF and EotN. How do the graphics compare to the later two? I read on one thread that Prophecies was less demanding, does this mean worse graphics or what?
They all use the same graphics engine. However, the later two campaigns do have some improvements in terms of graphics. One great way to see this would be to look at the water effects. In Prophecies water looks all blury and dull, but in GWEN it looks shiny and reflective.
As Jimmy said, they all use the same graphics engine. NF and EotN added a few graphics details such as the water effects, but the basic graphics, as in the look and detail of the scenery, armor, & etc., is the same.