honestly in the first one i didnt like marine girl or science girl, I'd rather hook up with Tali. She just seemed more interesting. Wish more was developed on her, marine girl was a horrible racist, and science girl was just ditzy space blonde. Tali on the other hand, I dunno just seemed more interesting, huge technical/engineering background, her race is a mix of BSG, the blue aliens from Daft Punk "discovery" music video, and several other influences that I cant think of right now (alcoholic limitations) plus she was trying to find something to either fight the geth or help her people. Way more could have been developed with her being that you were fighting the geth.