I do think it's a bit of a cultural thing. I saw Joey Barton being interviewed and he was talking about bollocking Valbuena when he was playing for Marseilles for not tracking back enough, and the manager took him aside and told him never to bollock Valbuena because he is not there to do any defending. He is the creative one, the rest of the team should do that side of the game, all his energy should be focussed on the attacking side. The thing is the team is so poor that Gil has to do a fair amount of the defensive side, especially when he is playing on the wing, which is just not what he's suited to, and in general the British attitude is that everyone should bust their balls to get back. So if someone is seen to not be great at it, they get stick, no matter if they are the most likely to actually create a chance at goal, or score a miraculous goal themselves.
As it is, I think Gil is pretty decent at closing down and pressing, he isn't the quickest over long distance but in short bursts he is pretty quick both with and without the ball, so if he was playing centrally he would contribute more to winning the ball back from the central defenders and midfielders. Playing wide he doesn't have the engine to track runs from wingers and full backs, so he gets exposed a lot more.