Actually, I think he missed the one major effect of our tutorial and personal tuition system: when you're not happy, they fix it.
For all the advantages of having an hour a week with a tutor going over your essay, the bulk of it, for E&M at least, is making sure that the 2-4 people sitting there understand that week's topic. That can be done, albeit not strictly as well, in a class. Lectures also should be more important, if they were done better, and made more core to the course.
However when this term the Univ economists realised that despite being interesting discussions and enjoyable tutorials, we didn't feel confident answering exam questions in macro because they were just that, interesting discussions, and not structured critiques of our essays nor long tutorials making sure we understand the topic thoroughly, we spoke to our tutors. Who immediately decided to give us two extra classes and lengthen our tutorials so we could go into the material in more depth. They also structured the tutorials to answer key questions and discuss important points, not just something around the subject. This means the problems were remedied while we were still being taught, and addressed immediately. That wouldn't be possible if we had a professor lecturing and teaching a class of 30 or 40.
In all systems things go wrong. Very few people have every single topic well taught. However when it does go wrong, the tutorial system means the tutor can listen to the problems and address it immediately, not just for next years class. It's impossible to feel like a number at Oxford, when your tutors rearrange their schedule because you have a commitment, or change things because of an individual request.