Raven Fire didn't read the article before posting. :(
My most substantive comment on these cards is about their relation to each other, which could create an article all by itself if I delved into the theory it exposes. For now, though, consider the implications of Force of Will occurring, in a typical month, about twice as much as Mana Drain. This signals that there is an ample supply of decks out there which have the recommended nineteen Blue spells to run FoW, but either lack the requisite sixteen Blue mana sources, or a purpose for running even a card as powerful as Mana Drain. It's not that they have no use for countering... it's that UU is too slow for their game plan. Let that sink in and remember it the next time you're looking at a decklist.