He's coming at Linkin Park from the angle of "New Sincerity," a burgeoning critical movement that values conveyance of honest emotion above all else. This movement has emerged due to our media culture currently being steeped in sarcasm, cynicism, and post-modern self-awareness. Once you recognize that, it's easy to see why he considers "Numb" and "What I've Done" to be songs that "hit hard." They hit hard because they are so nakedly about the painful emotions they are about. Free of lyrical complexity, free of instrumental complexity, free of structural complexity, they are unambiguous expressions of anxiety set to easy power chords and verse/chorus formula. I don't like those songs too much either, but the guy is clearly "for fucking real" and gave a fair bit of context to his perspective, which is more than most positive reviews have done so far. Instead, many of them simply through the songs one by one and say, "Yeah, this is a good one, Delson's pretty crazy on the guitar, et cetera and so on." Which are about as thoughtful as someone going through a grocery list and confirming everything they want is in their cart.