Partly agree
There are obvious limits to relying upon remote sensing technology from millions of miles away.
Still the prospects of human travel to Mars are daunting. The costs of mounting such a mission are staggering, perhaps a hundred times what we've spent on all the robotic missions to date. And the risks involved are much, much greater.
Frankly, we need to do both - continue robotic exploration and work to improve our success rate, while at the same time working in earnest towards a manned mission. I believe that means starting with returning to the moon and using that experience to develop a safe and successful real-time visit to the red planet.