3
Josh: Rift
Rift never really grabbed my attention at launch. I've dabbled over the past year since its launch, but the game's first expansion, Storm Legion, cannot be ignored. A lot of information was revealed during E3, and everything I've seen has convinced me to re-up my subscription and dive back in headfirst. The expansion adds two continents that are each as large as the entire game world that exists today. That's cool, but it wasn't what had me scrambling for my credit card. What got me was the E3 livestream demo of Storm Legion content that showed a massive open-world boss who, when he's defeated, tears down walls to open new zones of the continent to players. Let me reiterate: this boss doesn't just drop loot when you take him down, he drops ENTIRE ZONES OF CONTENT. That's awesome, and so is everything else I've seen about this expansion so far.
Runner-ups: Planetside 2 , SimCity