Usually if you delete a char before midranks, or havent really accomplished anything role wise in the grand scheme of things, you might not have been noticed by the Imms to warrant comments in your PBF. I think they make an effort to watch most heros or near heros though. Or if you are standing out in some way at the early ranks. Dont expect to rank quickly to 30, fight a few times, then rage delete, and expect some reviews.