I dont really agree with your statement, but I did find it perplexing that a C# .Net technical interviewer would not know the fundamentals of LINQ 5 years after its inception.
Time flies when you're building stuff, I know, but LINQ was actually announced at PDC 2005 - 8 years ago this fall.
That a C# developer can seriously say they're not up to speed with "new stuff" like LINQ (2005) and dynamic (2008) in 2013 is kind of ridiculous. What they mean is that they figured out how to map what they learned about Java in school into C#'s syntax and now they're done learning.
