LinkedIn needs to stop focusing on raw numbers and work on quality engagement. As a recruiter, I have had a policy of accepting any request over the years, and it has resulted in 10100 connections and almost no engagement. I almost only go to LI to accept my requests. The most value LI has provided has been as a directory and having accepted 10k+ requests, I now have a very open and thorough directory. If I was trying to use the site for anything else, it would be a mess.
I think there's a lot of opportunity for them to fix this (and they probably will), but it seems like they're focusing on growth first.