I'll post before the detractors
Even getting there is an amazing achievement, so I hope the coulda/shoulda/woulda naysayers out there really have a good look at what was achieved compared to what was not achieved. There is nothing here on earth that is comparable to a mission to mars - no not even a mission to the ocean depths as there will be a cable to pull you back up.
Getting to mars is a success, not landing is a disappointment.