walkman - 5:34 pm on Jun 13, 2011 (gmt 0) [edited by: walkman at 5:51 pm (utc) on Jun 13, 2011]
I thought I was immune to Google problems - 1200+ book reviews, been around forever (either 11 years or 17 depending how one counts it), simple clean design with Amazon links but not much else, unrequested backlinks from all over, nothing even slightly dodgy - but I've been hit now. Half my reviews have been pushed out of the index by random duplicates with no standing, the other half rank nowhere, and Google traffic is down by maybe 70% or more.
Heads up: You may not get much sympathy from many that assume that your site is 'bad' simply because Google's algo said so.
You have a choice to make, add a new template after all these years, wait maybe 6-12 months to find out, or do nothing and hope that Google backtracks. Matt Cutts has said that websites should be like Apple products, so you may want to look at an iPhone or iPad before changing the template. I would change the design since a 70% of traffic drop is devastating.
Deleting some of the index pages was a smart move IMO, but who knows if that will do. Not even Google engineers have a clue in Google support forums, they might just give general guidelines available on Google.com.
For all it's worth, many have made changes and seen no real and sustainable increase in traffic.
Edit: Just a did [google.com...] and some of your reviews have hundreds and hundreds of citations from scholar.google.com. Damn!
[edited by: walkman at 5:51 pm (utc) on Jun 13, 2011]