So, I don't exactly know the answer to your question, but I can offer an anecdote. A couple of years ago I was studying IR at an Ivy League college. I asked my IR professor which programs he thought would be a good match for me. We discussed Georgetown, Tufts, SIPA, and HKS. After, I asked about Yale Jackson. He said something like, "Does Yale have an MA in IR?"
I could be wrong, but from that interaction, I concluded that Yale Jackson has essentially no reputation in the field.