No, they do not reject all Jewish scholarship on the Torah any more than that of others, but examine it in the light of the Scriptures.
Classic commentator John Gill (http://www.studylight.org/com/geb) often includes Jewish understadning.
But you are presenting Jewish scholarship on the Torah as uniform, while i think it is not.
It is indeed uniform....to Jews. The way we explain that Rabbi A says “yes” and Rabbi B says “no!” is with the understanding that, “...These and These are words of the living G-d.” )an example: http://www.torah.org/learning/parsha-insights/5761/shemini.html)
So if you are referring to the (seemingly frustrating) way that rabbis say different things and that Jews seem to disagree on what to eat/dress/pray....this is how we adapt and overcome while fulfilling the mission of bringing Moshiach—making the world a dwelling place for G-d.
Another reason for the seeming disagreement of rabbis on the same issue, is that they are explaining a different level of the Torah (as I said, there are many, even infinite levels to G-dly knowledge.) Ask your local orthodox rabbi.