Firefall (http://www.firefallthegame.com/ ) is an upcoming free-to-play MMOFPS from Red 5 Studios, with highly stylized artwork and an emphasis on tactical combat. The game sets players in a world torn apart by the Melding, an energy storm that has spawned monsters called the Chosen. Players must now band together to collect resources, build weapons and vehicles, and utilize special nanotechnology armor suits called Battleframes to fight against the Chosen and reclaim the earth. Firefall is set to have PvE and PvP play, across a virtual game world spanning some ten square miles. Request your beta access over at the main website now!
The game capitalizes on the "dynamically generated" missions which can take a while to generate and can bug up a lot, but I tend to take on some of the world events while I wait, world events range from your usual work as a mercenary in ARES missions all the way up to defending a satellite up link from the Chosen in zone wide skirmishes. The level up system in the game makes you feel like you are actually getting somewhere by actually adding to your appearance as you rank up, not to mention beefing up your stats.