The difficulty lies not in whether Reality is accessible, but instead, how we calculate its effects on our interaction with that which lies outside of ourselves. Might this not be the appropriate time to question/grade one's ability to intellectualize our experience/existence? Regardless, and if our intellectual capacity is indeed as weak as it appears, then we must settle for what it does allows...an extremely gross approximation of Reality.
Having stated the above, one must consider what I have always affectionately termed, the bullshit factor, which really isn't bullshit [necessarily] but perhaps better thought of as pissing into the solar winds. It's a gross approximation of a gross approximation of a gross approximation...i.e., total bullshit.