This guy is good. If you watch the game again, you'll notice that he got the better of City defenders on a number of occasions in the first half. He has good ball control and a solid passing game. He's clearly being played out of position, we can all see it. . A typical winger is someone like Krasic. Martinez is nothing like that. He doesn't have the speed or the quickness to pull it off. I can see him play alongside Quag or IQ.
I won't judge his performance against City because he's just returned from injury. I think we need to see at least 3 or 4 more game from him before we can really judge him. Preferably as a S.S.