The number of truly "international" medical graduates being accepted into US residency programs has gone down. This is largely due to more US students coming back as "international" graduates from the caribbean. They have a huge advantage as compared to truly international medical graduates when applying for residencies because they have done their 2 years of clinical training in the USA at some of the underserved inner city hospitals, and thus can score good letters of reference from US physicians.
The denominator in the graph above for international graduates includes all true international graduates and the caribbean graduates and is thus deceptive. If you look at the "big 4" caribbean medical schools (georges, ross, AUC and saba), they do match fairly well into residency programs albeit mostly primary care and less desired specialties. What they dont disclose is that there is a significant weeding off of students in the first and second year due to several adversities.... academic, financial, resources and support infrastructure. I am not making a case for going to the caribbean straight away, but if your heart is set on being a doctor, and if you have exhausted all the options in the USA after at least 2 cycles, this is not such a bad idea as long as you are willing to work hard, can financially afford it and are willing to take a chance .
Regarding your other comment " it should be fairly clear you dont have what it takes academically to go to medical school". This is absolutely NOT true, there are hundreds if not thousands of doctors, who probably wont get into medical school TODAY, with the amount of academic competition that is ongoing, who are thriving and doing extremely well for themselves, and providing great service to lots of patients. Thus, even the medical schools have transitioned to a "holistic: review of applications, and not using just a standard cutoff of the MCAT and GPA, to select their students. I have several URM students who I have trained, with less than stellar academic records, who have graduated with flying colors and have made significant contributions to the medical field.
I have mentored and now am colleagues with several students who did their medical schooling in the caribbean, and the quality is not that different from US medical school graduates. There is definitely a bias, when they apply for residencies, and will be in the bottom most category (unless of course, if you have the right connections in the medical field, or if you willing to work hard, with the right amount of luck, then anything is possible, i have even seen some of them matching into highly sought after residencies )