The great thing about Gattaca is that the cinematography ages incredibly well on top of the amazing plot. A lot of great sci-fi is marred by cheap effects that look incredibly dated only a decade later. Gattaca chose to focus on the story and create a minimalist future environment that still looks beautiful 25 years later.
Also lots of sci-fi movies underestimate how much will not change, we live today with 200yo buildings, our cities won't look that different in 200 years.