Yup. Both malls are packed any given night of the week whenever I've been there. Definitely as far from dead as a mall can be.
Fair Oaks mall is closer than Tysons and isn't run-down. actually quite nice. but then again I've never been much of a mall person and dont go much. I prefer Fair Oaks to Tysons though, because those malls in Tysons are _too_ packed!