Shudder

I found this survey over on Reddit really interesting (albeit it's over a year old now): https://www.reddit.com/r/wow/comments/4v78n6/poll_results_mostleast_enjoyable_classes_and/ How would you vote in respect of Vanilla WoW? Which is your most enjoyable Vanilla class/spec? Which is your least enjoyable Vanilla class/spec?

Do you mind explaining this a little more? Which patch and what changes? My question way primarily driven by the fact that I am playing Warlock, and wondering whether I could have picked a more fun class/spec!