I had it in 2013 for the first time and thought it was just ok. I really liked it this year.
I think 2009 was my first experience with Hopslam, and it blew my doors off.
2013 was the first year it seemed "meh" to me. Wasn't sure if that was more due to a change in the beer, or if I had just gotten used to really good DIPAs being available for frequently, but the consensus seems to be that '13 was a down year and '14 is a return to form.