Might sound weird, but the best thing about the ship interiors is the sliding doors. I absolutely LOVE them. Well done devs.

Can we please have more of them, in more places. They are a REALLY nice Star Treky touch, and help the game feel more immersive. Maybe at space dock and other stabases. Rolling airlocks at DS9 would be super-awesome...
http://drexfiles.wordpress.com/2009/12/06/ds9-tech-manual-05-station-docks-and-airlocks/