Now, in the world of music discussion and such there are a few words that I think do get a bit, let's say, overused: terms such as "underrated", "overrated", "experimental" and such are often used as easy one-size-fits-all generic (non-)descriptors that get slapped onto pretty much anything that moves and don't really mean a whole lot at this point. One of these pervasive, quasi-meaningless buzzwords is "ahead of its time", which my good friend Gloob applied to OK's self-titled in his own little review of it. It really is a term I find a little meaningless sometimes, a little, you know, not especially descriptive and conceptually unsound. However, in this specific case, I am thoroughly convinced that the title bestowed by the man Gloob upon it is, indeed, accurate.
Source: Dio's musical strolls