From outside the Church I criticized all the typical Protestant complaints about Sola Fide, Sola Scriptura, etc. But little to none of that was based on evidence, and it was motivated by a direct hatred for the Church. My Grandmother told me that Catholic Churches actually had rooms where they tortured "Christians" (I only believed Protestants were Christians, and I didn't know the Orthodox Church existed.). Those were the kind of typical problems I had with it. I criticized it to show it's untruth's, illegitimacy, and charlatanism. Funnily enough, I went on a tour of our Cathedral yesterday and I didn't see the Torture room, but I bet it's just hidden.
If someone asked me if I was a Reformer, I would probably say yes. I am all for Reforming the Church, if that is understood to be, challenging it in new ways, trying to bring a spirit of renewal, and urging it to act as it should. But I am not a Rebel. My understanding is that the Church is not something you and 2 friends can start in your basement. And even though the 3 people in the basement might be starting it for completely Christian ideals and goals, I still couldn't call it a Church in the proper theological sense (but that's a whole other issue)
So from within the Church I criticize it because I love it. I believe in the Innerancy of the Magesterium's official Church teaching, but I also believe that this teaching is not making it to the Laity, the People of God, the rest of the Church. It exists in the Catechism, it exists in the speeches of the Popes and nearly everything they do. But it doesn't exist in the minds of most ordinary Catholics. And for this reason, I criticize day and night the Catholic Church. Not because of what it teaches, but who it teaches. It rarely makes it to the front lines as it were.
Just look at this quote from JP II
"God passionately desires and ardently yearns for our salvation... Nothing is greater than this: that the blood of God was poured out for us."- Pope John Paul II.
That's the gospel my friends, nothing could be clearer. And that's what the Church teaches officially. But like I said, when you get down to the local church you'll find the misinformation, the heresy (almost always Pelagianism or Judaism, ie. telling the story of salvation without mentioning Christ), and the apathy which is rampant (in my diocese at least).
I heard my dad explain once about the way that a parent gets angry at their children not because they hate them, but because they see them doing stupid things and not living up to their full potential. It is in this way that I get angry with my Church.
But as the hero of Western Christian theology said, "If you are silent, be silent out of love. If you speak, speak out of love."- St. Augustine. That's what I try to do.
Finally as a Reformer within the Church I find myself in good company, and I love this quote:
"The more administrative machinery we construct, be it the most modern, the less place there is for the Spirit, the less place there is for the Lord, and the less freedom there is. It is my opinion that we ought to begin an unsparing examination of conscience on this point at all levels in the Church." - Joseph Cardinal Ratzinger, now Pope Benedict XVI
If the Pope is for Reform, count me in.