It's hard for me to say this is my all time favorite expansion, but it is a definite favorite because it was when I started playing the game. I raided in a top guild on my server, and I have great and frustrating memories of raid progression. The one kill that meant the most to me was Leotheras the Blind in SSC because it felt like we were stuck on him forever! On the night we were finally able to down him, I got an amazing sword that I kept with my up until the wardrobe was released! I also have really fond memories of doing dailies on the Isle of Quel'Danas when Sunwell was released. Me and Pigletoos felt like badasses once we became exalted and were able to afford those expensive (for the time) titles!
Wrath of the Lich King
Mists of Pandaria
Warlords of Draenor
I'm not going to put Legion on here since we're still in this expansion and there are still more things to experience. Of course there will be a post for that later on! Again, I want to thank you all for sticking with me during this month. I hope whether you're an older follower or a new one, I made you stop and think back on some memories you may have. Once again another successful celebration has happened, and I look forward to doing something again next year!