87		Fallout 76 (Windows, 2018)
86		WildStar (Windows, 2014)
80		Rift (Windows, 2011)
80		Phantasy Star Online (Windows, 2001)
80		Phantasy Star Online: Blue Burst (Windows, 2005)
80		Project Visitor (Windows, 2003)
62		Fallout 4 (Windows, 2015)
61		The Elder Scrolls Online (Windows, 2014)
59		Mass Effect 3 (Windows, 2012)
57		TERA (Windows, 2012)
57		The Secret World (Windows, 2012)
53		DC Universe Online (Windows, 2011)
52		Asheron's Call (Windows, 1999)
51		Darkfall (Windows, 2009)
50		Endless Ages (Windows, 2003)
50		Neocron (Windows, 2002)
50		Neocron 2: Beyond Dome of York (Windows, 2004)
50		Face of Mankind (Windows, 2006)
43		ARK: Survival Evolved (Windows, 2015)
42		Mass Effect: Andromeda (Windows, 2017)
40		Atlas (Windows, 2018)
40		SpaceBourne (Windows, 2018)

Notes: Games similar to Defiance, Games like Defiance, Trion Worlds, Inc., Trion Worlds, Inc., Windows, Action, Role-Playing, RPG, Sci-Fi, Futuristic, Massively Multiplayer, Shooter, Persistent, Behind view, Havok, City - San Francisco, PC, Game Similarities.