Just to add a little bit to Manischa Mittal's response. I would recommend you spend a couple hundred dollars with SEM and test out several ad variants and see which ad gets the highest CTR. Take the creative winner(s) and use it to build your meta description tag.

Totally not an issue to be concerned about on any of those questions you asked - just remove the noindex tag and submit the URL(s) in WMT for Google to respider those specific pages faster, you'll be back up and running in no time.

I would only post the actual review content on one page (the main or most important page) to avoid duplicate content issues and still use the aggregate ratings and microdata code on the lesser pages so that you still get the stars in the serps. If it ever gains momentum and you have a lot of reviews, the pages will become more and more similar content wise and be a duplicate content issue.

you were penalized, so now your main pages don't rank for your main keywords, only your inner pages are ranking for keywords which aren't your main keywords. If you're penalized you won't rank for those anymore until you fix the issue so you're probably seeing the others you are ranking for surface.