I'm not entirely sure I understand what you mean by rating, but this sort of information may vary based on team context and processes. For example an agile team might look at a burn down or burn up chart to see what was committed to in a sprint, and what hasn't gotten done. I generally don't favor in putting blame on one aspect of the process though, teams need to work together to unblock and fix bugs when they arise. That's not always easy if the focus is always new feature, new feature.
Can anyone give rating on deliverable delayed due to Developer's or Tester's ?
Application software deliverable get's delayed due to Developer's or Tester's in IT industries?
Which are the valuable charts or process guidelines to measure this ?