Humans are not the best of the evolution, but they are just a part of evolution in the evolving life.
For eg., we can't say the old ancient creatures are inferior to humans because at their era ( olden age ) the environment suited which simple structures so they had simple.
Now nature has become complex so the human structure is complex and we cant say humans are the best, but they are a part or path towards evolution.
Hope you understand the answer :)
