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Even if your head is encased in a helmet (no matter how high quality) if your brain is subjected to instantaneous g-forces above a certain level, it will scramble. And if your head is being accelerated/decelerated in that abrupt manner there's also a very good chance your neck won't be up to the stresses involved either.
During my Air Force career I had to sit through aerospace physiology courses, some of which were simultaniously entertaining and frightening. One instructor had a film in which they'd taken the fight scenes, falls, and car crashes from several movies and analyzed them for g-force effects on the human body. The brain of Iron Man character Tony Stark (Robert Downey Jr.) racked up something like 8 or 9 accelerations/decelerations registering in the high fatality probability range in just one single fight scene (the one against the bigger silver-gray suit, I never actually saw the whole movie). This damage would occur no matter what sort of Unobtainium his suit was made of because your brain sloshes around in your head anyway.
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