Not really, the only "object" you can store, Amazon's language notwithstanding, is effectively a file. It's not like you could give it something that needed to be serialized.
And it's hard to see how it's "distributed" when your bucket price varies "based on the location of your bucket" as Amazon puts it.
It's probably more redundant than FTP, but saying S3 is like FTP is a reasonable shorthand and cuts through a lot of the marketing BS.