On the Usefulness of Quantum Physics

I have been giving some thought to quantum physics of late, and I would like to share my thoughts on the subject here.

Quantum physics studies the absolute smallest particles possible. There is no reason, therefore, that the properties of these subatomic particles would apply at the macro level. Why? Take, for example, table salt, sodium chloride. This molecule has neither the properties of sodium nor chlorine. It may well share some properties, but it lacks many others, and has its own unique properties. The same can be said of any molecule -- the whole does not equal the sum of its parts. Therefore, what works for a single atom may not work for a molecule or a collection of highly complex molecules.

Furthermore, quantum mechanics are still a relatively new science, and poorly understood. We do not yet know what exactly the smallest particles look like, or what they do, or if the properties we have currently identified CAN be applied on higher levels. This does not discount the usefulness of quantum mechanics. It is simply to suggest that, until we have a better understanding of them, a wider body of evidence, and experiments on a higher level, it is not useful to our considerations as philosophers.

To end with a question: is this analysis of quantum physics fair? Can we disregard this as-yet poorly understood field of science, and suspend our judgement until further research has been completed, or do we have an obligation to consider it, even if it is very likely to change as more data is collected and more experiments run?