The DC metro is absolutely NOT one of the best, for many reasons already explained by commenters. Many, many years of inadequate maintenance have caught up, to the point that this is a site that exists: https://ismetroonfire.com/

I live a half mile from a metro stop (out in the suburbs) and I STILL would rather drive into DC whenever I need to go into the city. It's faster, more reliable, and more convenient even with the hassle of driving in DC and finding/paying for parking.