I'm sorry you exspect pop music to have moving lyrics. Thats like saying Transformers is a shitty movie for having a crappy plot, no one disputes the fact that the plot was shit, but you were looking for the wrong thing in the wrong genre of film. For what it is Transformers is a good movie. Not everything is deep and has double meanings, sometimes you just have to take things for what they are. IMO pop music, and Justin Timberlake is catchy, and enjoyable to listen to.
If you take offence that is one thing, but to write off his entire discography because you think the lyrics are skin deep (which they are) is a bit absurd to me.
Also, I said your taste in music is shallow because you would want to eliminate work that people enjoy.