I would agree if we were considering GPA as the strongest leading indicator of a good hire. This seems like a straw man argument because its not what I said.

I would assume that arrogance, ego, and inability to adapt and learn comes out during the interview process. You should be weeding these people out regardless of their GPA.

Assuming they aren't afraid to admit they don't know something, or aren't a complete asshole, I want to know how you deal with the cards you are dealt - that includes going to class, studying for tests, and doing things you deem "unimportant." The last 20% of any project is where 80% of the time and effort go, and I want to know when that time comes that you won't settle for a "B."