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These are the 4 severity levels supported on Roslyn and how they are understood on the Code Cracker project:

1. Hidden: Only used for refactorings. See #66 (and its comments) to understand why.
2. Info: An alternative way (ex: replacing for with foreach). Clearly a matter of opinion and/or current way could be correct, or maybe the new code could be correct. We cannot determine.
3. Warning: Code that could/should be improved. It is a code smell and most likely is wrong, but there are situations where the pattern is acceptable or desired.
4. Error: Clearly a mistake (ex: throwing ArgumentException with an non-existent parameter). There is no situation where this code could be correct. There are no differences of opinion.

You can read directly on Microsoft's source code how they interpret these levels.