i dont think "too much grunge" is as accurate of a way to put it, but rather "too unevenly concentrated"
there are distinct borders that form when clusters of grunge meet the non-grunge.....
although actually i dont know if you'd even call that grunge at all.......it looks more like just dissolve filter effects
also, something needs to be done with the naruto pic on the left.......the white patches fade him in an awkward manner, when he should probably be standing out of the background more