Australian perspective:
We got 10%, which is obviously against the heart of our free trade agreement, but on the lesser end of things.
Being pragmatic, our products will be less competitive to US consumers because they now all cost more. Where there are US equivalents, our trade will go down. Where there are no US equivalents, or insufficient, our products will still be more expensive but there won't be many alternatives. Certainly other countries with >10% tariffs won't compete with our products at 10%. We'll still hurt, but less so.
The biggest loss will be for US consumers and the global economy. For Australia we will likely see slow downs across the world which will greatly affect us in that indirect fashion - for example we have a very large resource sector which will suffer during a global downturn.
As a general comment on tarrifs:
They hurt the poor worse than they hurt the rich. They are a regressive form of taxation. Nobody should be surprised, however, that Trumps policies are the worst for lower income earners.