I read a lot of the EU books, but couldn't get into the NJO ones and basically got tired of it too.

As for underage slash, I was 15 at the time and had no idea what I was reading until I got halfway through and said "ohhh". It was pretty funny in retrospect. Those days everyone hosted their fic on Geocities sites or on forums; warnings and disclaimers were pretty scarce too. Amazing how things have taken off!