Yes, mostly me, best summarised for the moment at: https://news.ycombinator.com/item?id=24737728 (tl;dr: of the two fictions, Smith et.al. require far more suspension of disbelief than Goldstein)

As for Smith's torture, I see:

Part 3, Chapter 1: hit on the elbow

Part 3, Chapter 2: beaten, but apparently not enough to break bones. Screamed at, but mostly questioned (not giving leave to urinate is another detail that makes me think Orwell was writing cathartically about his public school days. See "Such, Such Were The Joys".)

Part 3, Chapter 3: restrained. a "dial" of unclear action. scars of unknown origin (and we know that Smith already suffered from varicose lesions well before)

Part 3, Chapter 4: mention of dentures (but had he lost teeth from torture, or from his poor living conditions beforehand?)

Part 3, Chapter 5: failure to be tortured by rats

That's a lot of alleged hours of O'Brien's time, which presumably would be spent (as O'Brien, unlike Smith, got excellent marks on his A levels, thereby getting into the Inner Party) doing something of value for Oceania, rather than enabling Smith's narcissism. It's obvious Smith doesn't have any useful information to give up. How much of an example "pour encourager les autres" could Smith possibly be, considering the oh-so wide, expansive, nature of his circle of friends and acquaintances? The O'Brien of Part 3 is also cardboard, and reminds me of nothing so much as Johnny Hale from "Such, Such Were The Joys".

Consider also:

No sensory deprivation, no waterboarding. Nothing that approaches even Korean-War-era physiological-limit techniques.