Couple of things.
First of I don´t like Biebers music (exept for this glorios mashup
http://vimeo.com/39884322). Still I have respect for the kid as he gets much more hate than he deserves and (so far) handles it quite well. Seems like he can take a joke too, judgin from an apearance on Conan, which is always a plus.
Secondly, yes we do have a lot of shite in this day and age, but I wonder if it is not actually more shite getting made but the shite just having it easier to get out and be made famous (its watched because it is watched).
At any rate there is still a big lot of great music out there if you find it. Just to cite a few I really enjoy: Sufjan Stevens, Steven Wilson, Bon Iver, The XX, Van Canto, Fleet Foxes, Protest the Hero, The National, Saul Williams, Sigur Rós, Arcade Fire, Fall out boy, Ghost, Heaven Shall Burn, LCD Soundsystem, Regina Spektor, The Tallest man on Earth, etc.
Now when it comes to liking these your milage may vary and its a colorful bunch too, but they are all fairly new (to varying degrees, I think they are all about this decade) and for people who like the styles I believe they can really be concidered pretty good.
Thirdly: One thing that was good about the olden days of yore was that there were less distractions. That means more practiving the guitar. These days it is so easier to get lost doing other things I recon.
If I was born 20 years ealier I would be a much better player at this age I think.