[Devilboy]

It has explicit error handling (via multiple return values) which the authors argue is superior (even if more verbose) because they know from experience that programmers tend to make mistakes forgetting to check for errors in their code. If the error code comes back as a return value the programmer has to consciously decide what to do with it immediately, leading to better code on average.

[osi]

as long as you aren't calling what you consider to be a 'return void' function (like writing data to a socket). then it is easy to forget to check the return value.