Oracle is a bear to get setup. Nearly impossible, best I can tell, but the feature set is incredible. It's like Excel 2003 -- pretty much every feature you might want is in there somewhere, just need to find out how to expose it. For example, I've seen people say that its auditing and regulatory support has no peer. I don't really know that stuff well, but the ppl who told me spent non-trivial amounts of time with other solutions to see that Oracle made the most sense.
My point, if all you ever need from a database is solved with key/value store then Oracle is not mildly interesting.