Sure, we have dumb apps on our iPhone that we don't use and some of the preinstalled applications on OSX aren't that great.

But bashing Preview and touting the alternative Adobe Acrobat Reader!? Are you serious? Firstly, they are different products. Preview handles multiple file formats and Adobe Reader is meant for PDFs. Secondly, Preview allows you to edit, combine and covert pdfs all of which you would have to pay Adobe to unlock these features.

Preview is such an amazing tool and I would go as far and say it's one of OS X's killer applications.