I feel that video games have improved my brain to complete tasks which involve hand, eye and brain coordination with greater ease... for example, parallel parking. In fact, I have a feeling that it was vide games that really taught me to drive.
Games like Resident Evil and Zelda have taught me to be a better problem solver.
I KNOW tetris has taught me to be the master packer and furniture mover that I am today.

Games have definitely improoved certain aspects of my brain.