Impermanence and suffering in Buddhism
There is a convolution of meanings for dukkha which depends on context. One translation for dukkha is "unsatisfactoriness". 

Of course, it is not stated there is no feeling of satisfaction or pleasure born of impermanent things, as that would be absurd. I just ate a big sandwich and I can tell you I don't feel hungry, I feel satisfied with respect to hunger. I also would be lying if I said it was a painful experience.

In the introduction of the Majjhima Nikāya translation, Bhikkhu Bodhi writes:


  The unsatisfactoriness of the conditioned is due to impermanence, its vulnerability to pain and its inability to provide complete and lasting satisfaction.


So, one may find satisfaction on conditioned things. But that satisfaction is doomed to be  be partial and/or temporary. Therefore, it is not satisfactory in its greatest sense; it's, thus, dukkha.