We're in the realm of opinion here (and I *always* give that disclaimer when I'm about to utter an opinion, rather than hard, objective facts and/or Church teaching)
So my opinion is that we are in the worst crisis the Church has ever faced, bar none. Ok, I'll grant one possible exception -- when 10 of the 11 surviving Apostles had fled, and Our Lord was on the Cross. That was the last time things were this bad.
Early persecutions? doctrine wasn't ever in danger. The Faith was strong, souls were saved. What else matters?
Arian Crisis? yawn.
Great Schism? Been there, done that, got the T-shirt.
Protestant Revolt? yawn.
All the heresies over the ages? "cute" compared to Modernism.
I'm exaggerating slightly. I don't really mean those events were yawn-worthy -- only by comparison with our own age

Saints from all those ages would take off their hat to us, and be more anxious to talk to US about OUR experiences and sufferings living through the Great Heresy of Modernism and the Crisis in the Church, than we would be to talk to them about living through their own difficult times.
So I 100% disagree with Bishop Fellay, in his strong movement to downplay Vatican II as a "superheresy". No, it absolutely IS a superheresy, absolutely IS the boogeyman. That's how I was raised as a Trad, and that's how I'll die. I'm not interested AT ALL in mitigating or moderating that position.
You can't praise God enough.
You can't be too devoted to Our Lady, or love her too much.
...and, you can't excoriate and hate Vatican II enough.
Yes, I'm saying that we have to reject and despise Vatican II with our whole heart, and our whole mind, and our whole strength. The 100% full-throttle love of God we are commanded to have, and the 100% effort to hate error, absolutely go together. The more you love God, the more you hate that which is opposed to God and displeases Him. Starting with sin, and error is closely linked to it. Vatican II is a septic tank of error filled with seeds of sin and blasphemy.
Some things can't be exaggerated. The goodness of God, the holiness of Our Lady, and the evil of Vatican II.