This graph is misleading because it shows number of posts as a percentage, not an absolute number. I'm sure there is just as much or more quality content in r/programming and other subreddits than there was in 2005.

http://web.archive.org/web/20080129072548/http://reddit.com/...

http://web.archive.org/web/20140109132834/http://www.reddit....

http://web.archive.org/web/20140110004528/http://www.reddit....

You can decide on your own.