MCAS should sound an alarm, it should *NOT* over-ride the pilot, and drive the plane nose-down into the ground. If the 737 MAX can't be easily flown by a competent pilot without the MCAS band-aid, the 737 MAX should have its airworthiness certificate revoked.
Of course the 737 Max 8 can be easily flown by a competent pilot without the aid of MCAS. A competent pilot will be able to keep the craft inside the flight envelope in all but the rarest circumstances, and will never experience the action of MCAS.
MCAS is designed to save the plane if 1) circumstances get rare, or 2) the pilot is less than competent.
Even in situation #1, the MCAS commands can be overridden quickly by any competent pilot through a pair of disconnect switches if, in the pilot's competent judgment, it is hurting and not helping. In situation #2, MCAS is probably the last hope of saving the plane, since the pilot is too incompetent to do so unassisted.