Why not? The Corruption Perception Index[1] is the most famous attempt to do so. In their 0-10 scale--higher numbers being less corrupt--Russia is ranked at 2.1, India at 3.3, and China at 3.5.

[1]: http://www.transparency.org/policy_research/surveys_indices/...

Oh yes you can!

There are a few criteria:

1) Is the corruption social or economic in nature? ie in India, many years ago, it was impossible for someone from lower castes to become priests. An economic corruption at least has a remote chance of being breached by anyone

2) Is the corruption racial or religious or gender-based? I guess this is better termed "discrimination"

3) Is there a way to join the corrupted? ie if the police force and military are corrupt, is there a way to join them?

There are versions of corruption for which most people are physically unable to rise, and versions of corruption for which a clever few are able to swim with the sharks