You are correct the card does not insert into the slot all the way. It has been mentioned in various system reviews.
Today I purchased a Lexar Pro 1066x SD Card. When I slip the card into the slot, the card will only insert half way. The card does work, but I don't like the fact that the card is still exposed. Since it is exposed, there is a chance that I could damage the card by tipping the laptop on the side of the card. Why didn't Dell design the slot in the correct manner which allows the card to be fully inserted and removed by an internal push spring. Or am I missing something?
Dell Inspiron 5491 SD Card slot issue