Dropbox doesn't offer great encryption because the service is meant to make it very easy to share files and not a secure repository for your things. The gripe

Dropbox doesn't offer great encryption because the service is meant to make it very easy to share files and not a secure repository for your things. The gripe is like someone saying "this axe doesn't cut butter very well". Wrap your Dropbox stuff in TrueCrypt if you want security at the expense of ease of sharing.