Blacklight: Retribution
Zombie Inc. wanted to do a sequel to Blacklight: Tango Down. The result was Blacklight: Retribution, a first-person sci-fi shooter with mechs and a ton of weapon customization (most of which takes a long time to grind for if you don’t just buy). In addition, the inclusion of the HRV (hyper-reality visor) which allows you to see enemies through walls makes for a more dynamic game, with a lot less camping than other similar games.
It’s also totally gun porn.