Metro systems even in the best examples don't give easy anywhere to anywhere access. There are places you cannot access because there is no direct route and unlike a car there are no 'shortcuts' around going where the train goes.
So you walk the last mile? Not accessible to everyone. Neither is accelerating a two ton slab of metal to move one person around from exactly point A to exactly point B (and now you need parking at both points, which adds to the sprawl issue)
