That's actually ad-hoc cargo-cult, not a scientific assesment.
If a programmer uses a language poorly it can be the programmer but in a lot of cases it can also be the language, that has poorly thought out, conflicting, etc constructs.
There is a field called PL research (part of Computer Science) and researchers can all agree on several problems that C (and what would have been a better design).
Some of the problems are so obvious that the creators of C admitted them too. Some have been corrected in later revisions (C99 etc).
If a programmer uses a language poorly it can be the programmer but in a lot of cases it can also be the language, that has poorly thought out, conflicting, etc constructs.
There is a field called PL research (part of Computer Science) and researchers can all agree on several problems that C (and what would have been a better design).
Some of the problems are so obvious that the creators of C admitted them too. Some have been corrected in later revisions (C99 etc).