Janhoi,
From what I can see, regardless of what his intentions may have been, Benedict only mades things worse for the church, not better.  His edict to have records sent to Rome is a good place to start.  I have read repeatedly that the reason the man was elected pope, is that his brother Cardinals thought he could control the problem, and perhaps "fix" it internally.   So perhaps it comes down to that word "fix."  

What he likely SHOULD get credit for was raising PUBLIC awareness of the problem among those in the Vatican.  But for all the words, there's not a lot I can point to  of substance.  Maybe he just couldn't get stuff done, I honestly don't know.  But for me so much of his story is captured in the 250-ish cases reported at the boy's school where his brother was an official.  If memory serves, his brother said he was aware of the complaints, but that he didn't feel he could do anything about it...  Hard to imagine with a brother as high in the church as his...