I turned up the gamma when playing Doom3. This Resurrection of Evil (RoE) expansion's not so dark nor quite as spooky but I've had to turn down the resolution to get acceptable performance in some places (lots of transparent doors and one rather amusing use of what I can only describe as an analagous technique that my machine struggles to render).
They seemed to have continued the super-turbo-turkey puncher 3 video games machine theme.
I found a shotgun, too. Slow as hell but truly and awesomely lethal at close quarters.
RoE's 'gravity gun' does the full rag doll stuff that hl2's did; I suppose it's just id taking hl2's only original and only good idea and demonstrating that for them (id) it's no technical biggie to implement.
Lots of fun. Not as much fun as vBulletin3/entropysink, though - best game I've played in ages.
Now, is that sad or just very sad?