Some friends of mine once expressed the view that D&D isn't a good fit for Dark Sun. They saw D&D as being gonzo and cinematic, while Dark Sun is grim n' gritty.
Eberron would probably be better served by a 1920s pulp or Indiana Jones type of system such as Spirit of the Century. Ironically, here I think D&D isn't cinematic enough, it's too rooted in battlegrid gamism and/or the prodding with ten foot poles style of play. Although Eberron is replete with trap and monster filled ruins, it doesn't want to approach them in at all the same kind of way that D&D does. The action needs to be much more fast and furious, and much less Tomb of Horrors-y.