Difficult to say, but I'd put myself somewhere around a 7, I suppose. I'm not very good with some forms of media, but in others, I excel far beyond average, and for most, I'd say I have at least an average if not slightly better than average understanding of art/literature/media; it is, after all, where my talents lie.
I mean, It's not about art-skill or anything. More about the all-around package of using media in general, whether it's digital or analoge, traditional or modern. Also not art related. Baake broke it down to Media-critic (being able to apply knowledge and experience to new contexts), Media-knowledge (having knowledge about common media and media-systems), Media-usage (being able to use media receptively and interactively) and Media-forming (ability of shaping own and new media actively) For example, I wouldn't say I'm very media-literate because I barely know how any technology works that I use.
Media literacy encompasses the practices that allow people to access, critically evaluate, and create media. Media literacy definitions have been defined based on general skills pertinent to all media or definitions relating to specific mean forms of media. The US-based National Association for Media Literacy Education defines it as a series of communication competencies with the ability to access, analyze, evaluate, and communicate in a variety of forms which can be print or non-print messages. They find that media literacy allows people to be critical thinkers and creative in many messages like image, language, and sound. ->Media includes print-, audio- and visual media, including but not limited to digital media.