Jews focus on the messiah as a human being who has not yet come and who will achieve things in this world.
According to Judaism the true Messiah must
*Be an observant Jewish man descended from the house of King David
Be an ordinary human being (as opposed to the Son of God)
Bring peace to the world
Gather all Jews back into Israel
Rebuild the ancient Temple in Jerusalem
Unite humanity in the worship of God and Torah observance 
Furthermore, Jews believe that God gave a complete and everlasting covenant to his followers in the form of the Tanakh while Christians claim that Jesus brought a new covenant. The two views are incompatible.