My Penguinized site is definitely making some kind of recovery. Not a tremendous one - stuff like a page that's been at 650 for months suddenly leaping to 175. It got its sitelinks back sometime in the past month (that's how often I've been checking).
This could mean there's a Penguin update on the way... or it could mean my recent on-page SEO changes worked. Anybody else seeing movement on Penguin sites?
I started using Bing a couple years ago and really don't have anywhere near the headaches people who use Google seem to have.
AFAICT, Google's business model is to index the most stuff the quickest, which is a totally reasonable goal, but one that's caused a lot of problems due to half the stuff on the web actually only existing to get into the Google SERPs. Bing, having seen this, created an alternative model: they index slowly, checking for spam as they go, and there are a lot of totally decent pages that they may never get around to indexing. But the end result is that Bing feels more curated and Google feels more exhaustive.
Why Google seems to be getting worse at detecting copycat content and other forms of spam, I don't know.