It is good if you can come to US as an extern or acting intern. But I do not think it worths it, unless you have $6000 to waste. At least, I do not think it will help too much for the matching for docliu. The advantage you will have is to know some clinical people, but the rotations you picked are too advanced. There must be none US medical students in the same rotation where you were. If you want to do clinical rotations and help your matching, pick the ones that you are applying, e.g. internal medicine, general surgery, etc.