One of the things I find that makes the planets seem sterile is the lack of gravity difference between them. I mean, Nar Shaada is a moon, shouldn't we be leaping 20 feet vert? And Tattooine is so massive, wouldn't the gravity there be higher? But then again in the films we never see a gravity difference; but this is due to the prohibitive cost of filming extra terrestrially, and not necessarily by any fault of Mr. lucas.
Ahem.....Your Physics and Logic are not welcome in a Fantasy IP where there is FIRE AND SOUND IN SPACE!