"Any further thoughts? My take is that the gaming community generally thinks BHD and 24 are "good" and not bullshit-cheesy garbage entertainment. "
Of course not, I love 24 Jack Bauer is a legend on so many fronts...
Anyhow, I'll conclude with my belief that you will have to go for first-person voicing, as the context of the plot and game design requires for the character you play as to communicate fluently with those around him, being part of a specialised team. Compared to Gordon Freeman, for example, who's alone and confused - he doesn't need to speak for the cohesion of the game to flow.