I'm saying that based on the opposite, I've seen a lot of Keane and Thorpe. You said that De Vrij is not better than those two. I disagree, if they were that good they'd be starting in the first division in the Netherlands, or the first division of some other country, or in the Championship in England.
Tom Thorpe had 6 appearances for Birmingham on his loan, who finished 21st in the Championship, he couldn't nail down a starting place at that level.
Michael Keane earned 4 starts in the first half of the season on loan at Derby, unable to nail down a starting position. He had better results at Blackburn, who finished 8th in the Championship, where he had 13 appearances in the second half of the season.
Personally I don't think either have the quality I've seen from de Vrij at the WC. But I'll happily admit this is far too small of a sample to make a decision about his true overall quality.