Those kind of dialogues interectations add so much to the immersion. What are your favorite quotes/dialogue from the game?

Engage standard morale boost, for the emperor!

I like when Biovore shows up and I instantly connect with my Battlebrothers via some astrophatic mind channel so we can share disgust and hate together. 

Only taxes I hate more than Biovore.

I like punctuating every scripted dialogue out characters say with "For the Emperor!" As a litmus test for the level of enjoyment my two brothers are having. Generally people won't emote when they are not having a good time but will do so enthusiastically when they are really in the moment.

As for my favorite line... well it is from that same guard officer. "We've got a pileup on our hands, my lords, get a frag in there!" He's so cute, telling me how to kill tyranid swarms.