Yeah, he needs to play in a 3-5-2, where his defensive responsiblites are limited. I agree he is better, but in a 4 man defense, he has a tendency to wander upfield too much and leave his teammates out to dry.
Imo there is nothing wrong with R. Carlos, he is vey good going forward and his pace allows him to recover from some bad situations
You cannot have it both ways its either you are an attacking team like Real Madrid where Roberto aids in the atacking process or you are a defensive team where you do not have a player like him.
Its like Cafu at Roma, who cannot defend at all but he still a great player
Imo weak links are players who do not aid going forward and are not very good defensively
Or in Real Madrid's case Players without pace at the back and put their side in trouble, thats why for their sake , Hieroo's retirement cannot come soon enough