I know this question isn't exactly related to exit rate.
However, I was wondering if anyone here knows whether or not my site is still being affected by Panda. My site was hit by the first wave (Feb 2011) and traffic gradually dropped until I lost 80% of google referrals.
During May and June, I aggressively took steps: rewrite the entire site structure, delete over 2000 so-called thin news articles, delete a dead forum. Perhaps there's something here I did here that helped. My site finally was no longer penalized during the late July Panda update.
Now, here's the part that I still haven't figured out. My traffic is only 45% of what it used to be before. My news section traffic is only 23% of what it used to be before. I understand my news section would suffer since I deleted a lot of content from this section. However, the part that still suffers is my review section (I didn't delete any articles from this section).
My site now ranks pretty good... I rank in the top 10 for a lot of competitive product keyboards, yet my traffic - particularly reviews - is still not what it used to be before Panda.
I'm not so sure that you need to be able to say definitely if it's a Panda punishment or something else. Bottom line is that you know your review section is getting a lot less traffic, and I assume this is an important section for your business.
So I'd say dig into the analytics for the review section a lot deeper. I'd be checking the rankings and the search traffic, page by page, for the losers (hopefully you've got historical data so you can compare). If you can do that I'll bet some insights will start to pop.
The other question I'd ask is if you made any changes to the internal linking and navigation - anything that might have cut off the flow to the review pages a bit.