I agree with the sentiment that McQueen, Hawkes, and Vansen (in that order) basically carried the show. As far as lead characters go, Nathan West was a pretty weak one. Maybe one of the few negatives points in that show.
Here's a clip which continues right after that moment... McQueen taking on Chiggi Van Richthofen singlehandedly, avenging the death of Lt. Winslow. Probably one of the show's best episodes: