H,
If I had arrived from the Chilean side, sitting in a jeep up to 5500-5800m on a sunny day, I may have said Ojos is much easier than Aco.

I walked solo from Incahuasi (6621m, which I summited two days earlier), with provisions for 12-14 days. The weather was really crap, no good maps, illegal crossings into Chile, 4 passes over 5600m etc.
I think AD is grossly overrated, would say F with one section of 5.4 rock.
So do I in a way. I talked to some Argentinian climbers about this and they argued that the technical part was at the worst possible place, i.e. just underneath the summit on an almost 7000m high peak. True, but still...
According to "my rating system", it can never ever be a F though. F is a non-tech ascent, a complete walk up and if there is any talks about using ropes it is at least a PD.
Do you have any pics?
I should have. Shot a roll and a half on summit day. Lousy weather, so the result will probably be bad. Do you wanna have a look at them later?
C.