Fucking hell, I think Doom 3's audio logs have ruined the experience for me. In a really sobering realization, that is.
Listening to each one and slowly piling up a record of corporate abuses, knowing that each and every one of the narrators is dead or worse, just really sobers you. The zombies may share 3 models, but they have faces and names. Every Z- Sec you killed was most likely just some family man who had the wrong assignment on the wrong day and become another soldier in the legions of hell.
In essence, fuck Lost Souls ever more than before now.