I graduated from ancestry.com's record collections a long time ago If you are deep into your search, it's unlikely you will find much of worth domestically, though it can be handy if you are trying to look broadly (i.e. at all the potential relatives of a given surname) at something like state vital records. Internationally there is far more available on familysearch.org databases and the old-school microfilm. Ancestry has been ramping these lately - Ireland is pretty solid, Germany is starting, but you will probably be waiting a long time if you are hoping to put your names in the boxes and have an image come out. The good news is you have the trial and can go a month at a time inexpensively to see whether it is worth it.
I disagree with Jerry on the value of newspapers. Obituaries can sometimes give you that birthplace back in the old country that you would never see elsewhere. I have also found some of the most interesting things I know about my ancestors through newspaper collections since you can get much more than names, dates and places in the articles. As far as the various services go, the value depends on how prominent your family was in their community and whether your area is covered for the time period you care about. Even with OCR problems if you know marriage and death dates it is possible to find articles by scrolling through the pages. While OCR is imperfect and will rarely let you find everything, learning how to work around its issues can help to find much of what it does not show in its results. By this, for example, I mean substituting "l" for"i" (that's lower case L for lower case I) and trying other such variations.