I've heard this thing before, but it doesn't make me lose respect for NB. I'm not a particular fan of their music, but it doesn't make me hate them. I mean (I know it's not on the same level) most of AC/DC's songs are just three chords played at different rhythms. Compare the riffs to AC/DC's Whole Lotta Rosie and Let There Be Rock. Almost exactly the same, except Rosie is written in A instead of E. And also, a huge similarity for AC/DC is the riffs to TNT and Dirty Deeds Done Dirt Cheap.

Repetitiveness isn't necesarily bad.