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It's even worse. Fister's 2012 was injury shortened which reduces his total WAR. While he's has a slowish start to 2013, I think his talent level is higher and is likely closer to being the 5 WAR pitcher than a 3 WAR pitcher.
Who would you rather have pitch a game in the playoffs against a great hitting team? I'll take Fister. Vargas can spin some great games on occasion when the CU is really working, but I think Fister is more consistently good.
If we had gotten something great back, well, then fine. But instead we have a wasted lotto ticket.