1script - 9:18 pm on Jun 3, 2013 (gmt 0)
@hitchhiker: I would NOT remove meta descriptions but rather work on making them more enticing to click at in SERPs. It looks like your site has a rather complicated coding with quite some JS thrown in, I don't believe Google will be able to come up with cohesive or even human readable descriptions for your pages on its own. If your listings in SERPs look awful, noone clicks, Google loses interest in showing them. Traffic falls even further, vicious circle. Don't just drop descriptions, figure out the way to make reasonably well readable meta descriptions out of whatever is considered content (including UGC) on those pages.
As far as changes, I've done all the same except for one thing: deindexing image pages. I would not deindex them, especially if some of them are popular. What was the reasoning, anyway? Too little text? That should not be too big of a deal if they have "alt" tags and there's text on pages that have links to those images.
We'll see at some point in the future if the changes make any difference, or so I hope anyway.