I fault him for being irrational. For adding two and two and coming up with either 666 or zero, depending on how he felt that day and how things were going. For saying extreme things about apostate Rome and antichrists in Rome that maybe for him were a way of letting off steam but became a philosophical and theological Twilight Zone for those who take his word and example as Gospel and Creed and have to reconcile those things with his softer words on Rome as only misguided in good faith and not SO bad.
One of the worst things he ever did was to point out the sins and failings of dead popes and to equate THAT kind of PERSONAL "badness" with the DOCTRINAL badness of the Vatican II putative popes. That was taking cruel advantage of the simplicity of the lowly faithful. It was what Scripture calls "making a lie." (And I hasten to add that as far as I know His Lordship did this only in passing and with some diffidence, not with the gleeful thoroughness of some lay SSPX apologists.)
I still think that there was something personally heroic about His Lordship's abortive efforts on behalf of Christ and Truth at the Council. I don't care to point the accusing finger at a worthy old man who brought himself to go so far in his stand against the Roman Antichrist but could bring himself no further.
On the other hand, I don't think that he has done any of us any favors. I had my tragedy as a Catholic in the 60s and he had his and my butcher had his. I reacted in my way and he reacted in his way and everyone else reacted in his way.
There was no latter day Athanasius against the world, no John faithful even unto Calvary while Peter cowered, no glorious upholder of the Catholic Way whom the faithful should see as raised up by God for their rescue from the Roman Pontiff and his New Pentecost. Archbishops, great neo-Thomist theologians, Portuguese Marian seers, Italian stigmatists, American Catholic schoolchildren, it was a matter of perfect democratic equality of loss and horror and wretched haplessness as Catholics.
But at least I was given the grace to be compromised as a Catholic (by the new catechesis) without putting my signature to my own compromising.