I swear this forum is the most bipolar group of people ever. One minute he's world class, another minute he's always been shit. It is possible for great players to have a bad game. It is also possible for bad players to have a good game. Now I'm convinced it's the former rather than the latter.
I think it's a major stretch to call Otamendi a "great player". Decent CB yes. On his day, very good (his derby display, particularly 2H for instance). But for a club with our ambitions (to be best in Europe), I think a fairly material question mark as to whether he makes the grade.