Your question leads directly to 2 important considerations.
First, whether the physical laws we discover through science are merely 'resemblances' - that they reflect but are not actual natural realities; and Second, that the laws of physics do reflect physical content or constituents themselves as it is like in nature. This in turn depends on your own metaphysical view of what is possible to be known by the human senses.
The problem with the term 'Laws of Nature' that is often used in science today (or in textbooks) is that it is a misleading way of putting what in actuality are our best theories. These theories are what, after multiple tests and confirmations, verified as they are separately in experiments, are considered to be true because they give us the best results. They are not considered final.
In this sense, 'Laws' as they are used, are actually tentative theories, they are not the final say in any descriptions of reality. This is because even the most well tested and described laws, such as Newton's Laws of Motion and gravitation, have limits. For instance, after Einstein, the laws do not give predictable results at high speeds or small quantities.
Thus, Laws can never be Laws in our modern sense of certainty because they are incomplete. They raise further questions about physical phenomena that require further experimentation and testing. These questions are raised when we synthesize it with other laws that we know from other experiments, or from before.
For example the recent discovery of the Hiigs Boson can be considered a result that has been built upon not just our knowledge of quantum mechanics, but also our understanding of electromagnetism and classical mechanics.
The lack of a unifying theory does not mean that we do not understand nature. Often, we are dependent on these theories to built upon our understanding of reality and nature. It is fundamentally important then to distinguish between the metaphysical question of whether nature can really be discovered as it is by our senses, and whether there are laws of nature that are scientific theories to be discovered through experimentation, that are dependent on our senses.