I recently came across this lengthy and harsh critique of ACE in particular and animal-focused EA more generally and to some extent EA more generally. https://medium.com/@harrisonnathan/the-actual-number-is-almost-surely-higher-92c908f36517#.kq58x4oor
I don't know what to think about it, since I don't know much about ACE. I'm sure some of the concerns it raises are valid, but I don't know how many.
I'd be very interested to hear what people think of it.
(And more generally, I think it's important to promote the norm of openly entertaining and discussing criticism of ourselves)