Ben Deker is much more than a tagger!  Tags are the artist 'names', usually done with thick black markers and repeated everywhere, like a dog weeing on lamposts to mark its territory.  Tags imo spoil the urban landscape and give graffiti a bad name.  Bottom LH corner of this photo shows the tag of the artist who put this piece on the wall, like a signature. Fine in that context, but scribbled all over the place smacks of immaturity.  Well, that's my tuppence worth!!