We work on a fine art site. In May we were attacked and blocked by Google for about 12hrs until we cleared all affected pages and files. Our response was pretty fast, and to be fair, so was Google's action to unblock us.
However, shortly afterwards, the entire site's page rank disappeared, it never came back. I also believe people are now speculating that Google's PR updates are either overdue or have stopped, so I can't gauge PR at all.
One way we can gauge potential for position is that we remain top 1-6 in Bing for most terms. Moz authority reflects this as well. An example:
https://www.google.co.uk/search?rls=en&q=doug+hyde+prints
These are the types of position we occupied on Google prior to the drop. We've been told there are no manual actions against us, nevertheless we've worked to clean out any duplicate content and disavow some link trawling/people directory sites that duplicated a lot of our content. Page code has been cleaned up, pages optimised, loading times reduced where possible etc. etc..
This chap seems to have had similar issues back in 2011: http://moz.com/community/q/not-ranking-well-after-site-was-hacked
Any input/experience gratefully received. Working our wotsits off to generate traffic off no PR and Adwords at the moment and it's a struggle. I've actually got new sites to rank faster and better than this in 3 months, so this is one big penalty.
Roland