Well, this is an interesting point of theology. I believe that Jesus referred to the Septuagint, not the Hebrew Bible, and therefore the Septuagint is itself a divinely inspired, or at least divinely authorized, translation. I find that suits my purposes, as I seldom refer to the Old Testament, anyway, I am far more interested in the words of Christ. Of course, learning Hebrew is a good idea too!
Yes, I agree, the Greek of the New Testament is clumsy, it was clearly not the first language of the authors. But I haven't seen convincing evidence that it was originally written in some other language, such as Aramaic. I don't find that very persuasive.