"If it weren't for these damned neural implants, you'd be a smoking crater by now." - Terran Marine, Starcraft.
"Armour Superiority" - GDI Mamoth Tank, C&C3 (I dunno, I just like it.)
"Ya! Vat do you vant!?" - Wermacht Pioneers, Company of Heroes.
"Give a man some bullets, he will want a gun. Give a man that gun, and he will be handing out the bullets" - Sam 'Serious' Stone, Serious Sam 2 (Sitation needed on the exact wording, but it's close enough.)
"No sense crying over every mistake, just keep on trying until you run out of cake." - Glados
"These guys have seriously lost their heads." - Sam 'Serious' Stone, Serious Sam: The First Encounter.
"Maybe I'll shoot left handed" - Lt. Nick 'Havoc' Parker, C&C renegade.
"What kind name is 'Soap' anyways? Sounds like a Muppet" - Cpt. Price, CoD4
"I sence a soul in search of answers." - Protoss Observer, observing something from diablo that I don't quite remeber.
"Oh, so I guess I'm a dirty little cheater now." - Logan, when entering cheat codes. Tachyon: The Fringe.
"No prisoners, no survivors" - Gradenko, C&C Red Alert 1.
"High speed, low drag" - Most Allied vehicles in Red Alert 2, and only the IFV in Yuri's Revenge.
"Rev up the whizzers!" - Yuri Gattling Tank, RA2 Yuri's revenge.
"You're the king? I didn't vote for you." - Human Worker, Warcraft 3
"I bare gifts." - Chinese Nucklear Artilery, C&C Generals.