I'm not sure whether the average US university is better or worse than the average European university, but I can say that once you're not talking about the top few schools (Harvard, Stanford, Oxford, whatever) the university itself matters little to employers unless they went there or it's infamous for some reason. So the University of France Calais may be amazing, but it probably won't be viewed as significantly different than Penn State by your average employer.
Nothing would make one think so. I believe what Kephael is saying is that most European universities are unknown quantities to American employers. So said employers will tend to equate them with known quantities - the many American state schools of no particular distinction.
This has nothing to do with the quality of the schools, the education they offer, or the skills of their graduates. It has everything to do with the schools being unknown.
