I had ACL reconstruction in BlackRock Clinic years ago. Aside from tearing it again a couple of years later, I couldn't really fault the experience, although the recovery from the op was indeed excruciating, much worse than the injury itself.
I've had subsequent minor knee surgeries (scopes, keyhole, etc), both publicly and privately and in my experience the private service was much better than public. I've always felt rushed out the door during public consultations.
So sorry to hear of your experience in Santry. I have no direct experience of it but it seems to be where all the top gaa stars get there surgeries, especially ACLs.