User blog comment:Braumissomanly/some items a bit to strong?/@comment-2112140-20140726111635/@comment-24613667-20140731035339

DFG is basically a mini Deathcap + Void Staff combo that lets you snowball into your Deathcap and Void Staff. I personally think it's a very unbalanced item because of its complete lack of counterplay: click champion with a targeted damage amp (ie: can't miss), dump skills on champion, champion is dead, repeat for infinite money.

Is there more to it than that? Yeah, but that's generally how the scenario goes, which is quite boring and unfun. The 4.13 patch notes hint that they're trying to do something about the DFG's one-dimensional gameplay, but we don't know how long it'll be until that happens (for now, we just get an increased active cooldown).