I agree. I used to make the mistake of screening on language trivia and simple functional ability (like they're doing here). HUGE mistake.

Now I screen on much bigger topics that tend to be more philosophical in nature. The role of design patterns, benefits of one language over the other (particularly functional languages), value of unit tests...

They submit their answers via e-mail, and within a minute or two I already know if there is any value in at least talking to them in a more formal interview setting. I've found that folks who understand development at this much higher level always handle the basics well.