Before I joined music forums, I thought that all the music had gone to shit, too.
I would have to agree with you that to some extent, the majority of the music quality as compared to the 60's-70's era is not as good...
but theres DEFINATELY a ton of music out there if you look for it (which is not very easy sometimes).
If you are looking for rock'n'roll greats nowadays, chances are you aren't going to find many. Rock'n'roll has evolved itself into many new genres of drum/guitar/bass instrumentalization (is that a word

?).
Maybe you could tell us what type of music you're lookin for and we can make some suggestions to help you find the "greats".