Nu-metal's marketing points are it's apparent 'coolness', songs structured with very simple musicianship (in keeping with grunge philosophies), the angsty lyrics, a marketable style which mostly fuses sportswear with grungier, baggier styles, and the feeling of being an outsider or one of the un-cool kids (this is quite ironic as most people who jumped the nu-metal bandwagon at it's height were popular people or became popular as a result). It is one of many fads employing the 'anti-cool' philosophy. Most people who adopt this lack the intelligence to see the irony.
Nu-metal gradually phased out as predicted, and the very same idiotic crowd would be seen later jumping on the emo bandwagon, which is popular at the time of writing. The style would drastically change from stupid baggy jeans to horn-rimmed specs, lip piercings, etc. Whatever fad, though, most scenesters have a LiveJournal account.
Nu-metal is reviled by dedicated metal purists, particularly classic metal and death/black metal fans. This is because it is seen as a false type of metal. Whether this is true or not, the point is defended by the fact that nu-metal was the epitome of crass commercialism. Tragic also, is the fact that nu-metal is the predominant perception of metal as a whole, which has led to would-be real metal fans writing off an entire genre of inventive and inspiring music.
Nu Metal is closely related to rapcore.
Look at the "broken love"/other themes ratio of most genres. For pop, it's 90/10, for example, 80/20 goes for emo, hip-hop has almost no love, but that's another thing. You see, nu-metal DOES have love songs, but they are different from the masses, and the ratio is something like 40/60.
And why should people blame nu-metal for being mainstream-friendly? Why, in fact, is being "mainstream-freindly" bad? The mainstream is what most people currently like, and, even when its fashion goes away, there would people still listening to it.
And, who cares what kind of people are the musicians? Probably most famous classic music composers were mean bastards, but their music is still remembered. The Beatles were dope-heads, but they still are great. Understand it, nobody cares if Fred Durst is a poser. If you like LB, you like it. And if you don't, you don't.
So stop f***ing around and don't forget that music is made for people to have fun, not to argue. K?