Yes, Ancestry.com accounts almost always automatically renew (read the terms and conditions before you agree to them). You should have received an email about it before it renewed. However, as t4me observed, customer service seems to be decent about it if you honestly didn't realize it was going to and they can see that you haven't logged in recently. For the record, here's a site with a couple good explanations on how to avoid issues with Ancestry.com (unofficial of course, so you get the truth): http://www.familytreeshortcuts.com/avoiding-issues/
Also, you seem to think that Ancestry.com doesn't have many records. In fact, they have the most extensive online database for genealogy records in the world. It's true that their are some records you can find on other sites for free, but most of them you can't. If you ever resubscribe to Ancestry.com, I recommend the Card Catalog for finding the elusive record databases. See a tutorial at http://www.familytreeshortcuts.com/the-site/the-card-catalog-is-your-source-for-...