I'd also add that the Source engine is the only engine (that I can think of) that has scaled for three console generations. Half-Life 2 was on Xbox. The Orange

I'd also add that the Source engine is the only engine (that I can think of) that has scaled for three console generations. Half-Life 2 was on Xbox. The Orange Box (HL2: Episode 2, Portal, and TF2) as well as L4D (and dozens of other Source games) were on Xbox 360, and Titan Fall was on Xbox One (lauded as one of the premier next-gen games).