It probably helps to step back and realize the difference between a plurilateral agreements, multilateral agreements, and law.
You can't compare it apples to apples to PIPA/SOPA.
Read the agreement
That's the best resource for ACTA. The AccessNow pamphlet did make me giggle though, especially about when it went on about how undemocratic an ACTA Committee would be compared to the WIPO/WTO.
I'm not blind though, it does affect hosting providers who have otherwise relied on the belief that legal disparities between countries have acted as a barrier for copyright holders to 'make a presence' in another country. With ACTA, the barriers are lower and the normalization of laws avoid *weird* black hole situations, likely allowing more uptake of legal action across borders. You still deal with your own legal system, along with its own set of due-process and privacy laws which ACTA cannot override.