A genius scientist who happens to look like a model... martial arts expert... expert marksman... has bulletproof skintight jeans.. WTF, Marc?
The same could be easily said about Gordon, except you know, the part about being a model and wearing bulletproof, skintight jeans. Really, they never did reveal where homeboy got his soldierly skills from, or his weapons and tactics training. Hell, Valve even makes fun of it a little bit when Wallace Breen's doing his little propaganda telecasts to his "citizens".
As far as loosing respect for Laidlaw, meh. It's just one mistake where he is concerned, I think. Not saying he's not committed others with the storyline, he's still a decent writer and author as far his own stories.