The key benefits of the shuttle design was its ability to deliver a good sized payload and or crew into orbit and then be able to re-use the vehicle.
Unfortunately, it hasn;t performed like a PeterBilt or Mack truck, tho it has been a workhorse for a lot of years. But we do need a new approach and better vehicles if we ever hope to travel further out into the solar system.
As a normal citizen, and no scientist, I occasionally pick up a book or two on space, just for the interest of it. We normal folks pick up books with "Mars Direct" missions and think "Why not?"
Then I read that every time we launch a shuttle we are essentially rolling dice. So for a simpleton like myself, the question is " If we have a hard time managing this, how will we ever get to Mars?"
But once again, I am just a simpleton who would like the see the first man on Mars wearing an American Flag on his arm.......