Any information we can gather about other planets in our solar system has scientific value. Electronic equipment cannot record everything; there are some experiences that are unique to humans. Therefore, sending humans to Mars makes sense in order to capture that which only humans, and not computers, can comprehend. Missions to Mars are wise.
Manned missions to space have value. The manned missions have astronauts aboard who can scientifically monitor and research space exploration. Unmanned missions are mostly performed when it is hazardous for astronauts to man the space flight. Also, manned space missions have value because the images from space are more explicit.