Ideally your program can communicate with the reader in code and not in comments. The ability to write software that other programmers can quickly understand separates the best programmers from the average in my opinion. Typically, if you or your colleagues cannot understand a section of code without comments, than this is a "code smell" and refactoring should be in order. However, there will some archaic libraries or other integration that a few comments to guide the average developer is not necessarily bad.
