N'Sync was a group put together by boy band guru Lou Pearlman. He just assembled a bunch of good looking guys with musical aspirations and gave them a theme. The recording label did the rest.
Nirvana was a group of friends that started playing together in their garage as teens. They played their own instruments(which N'Sync did not), wrote their own songs(which N'Sync did not), and passed their demo records around at local concerts hoping to catch the interest of some music exec.
I can understand why you think it's not good music, it's not for everybody....but a marketing ploy? I'm not seeing any connection with N'Sync, outside of the fact that they both sold a lot of records(and I guess that they're both all-male groups).
