As for them not being Rambo, it happens. Green Beret gets out of the service, eats pizza, sleeps late, stops going to the range or doing pushups or practicing hand-to-hand people get soft.
Not everyone can be John Matrix.

It's obvious that we were seeing a list of hits, those being Matrix's men, not just the random murder of a Cadillac salesman because Cook wanted a car.
As for them not being Rambo, it happens. Green Beret gets out of the service, eats pizza, sleeps late, stops going to the range or doing pushups or practicing hand-to-hand people get soft.
"Aren't you a little strong for a lady? I'm calling wang"

and the other guy lets Cook run him over with a Cadillac.
How do you know the salesman was one of Matrix' men? Cook may have killed him just for the free car, not for the sake of killing him.

My iMDB profile
http://www.imdb.com/board/24297325/?ref_=fn_al_nm_1

To be fair they didn't look very elite or up on their training.
John was still in shape and a total BAMF.

I think you've watched too many movies: even the best trained members of The Unit would let their guard down when the garbage collection dates change, or an awkward customer makes a confusing statement about prices. This is kitchen-sink hyper-realism, not one of your damn Jean-Claude Seagal movies.

Bad flaw in the movie if you ask me.
Commando has no flaws.

True: John Matrix already knows exactly when garbage collection day is. John Matrix already knows the best thing about the car.

They needed your training, John!