Time to be blunt. World of Warcraft is way better now than it was in vanilla.
Before you gasp and get a case of the vapors, let's get real here. I'm me, it's true, you know it's true. The talent system? Leaps and bounds better than the last minute Diablo II clone we got in classic. Raiding? Raids today are more accessible, better designed, and far more varied then the resistapaloozas we got back in the day. I say this as a dude who farmed UBRS for the Draconian Deflector and who tanked Princess Huhuran in cloth freaking booties because they had nature resistance on them. Throughout its near-decade long run, World of Warcraft has constantly changed, iterated and improved on the experience it provides. Every patch, every expansion has made adjustments and tweaks, and while nothing is perfect and not all changes were good (We all know that any change to warriors that didn't make them invincible supergods wasn't a good one, am I right? Why are there so many crickets here?) the game has moved forward with new systems and features.
For me, it's interesting to look back over the history of the game at those changes that really improved the player experience or changed it in a fundamental way, that altered how we play. And so, now I'll do exactly that. With Flex Raids on the horizon for patch 5.4, what else can we look back on?