You are right but it's comparing apples to oranges. If you compared missions of comparable weight you would find that capability of robotic missions increased many times over current missions, reason is that any human mission would be much more massive than current unmanned missions. This is especially true for long range manned missions where crew needs food, water, shielding and space to survive long term in space, for a robotic mission distance is just time.

What robots cannot do well is be flexible in their mission. This is something that humans excel.