They're NOT non-partisan.
You should watch Fox because they're the only tv or newspaper source (other than WSJ)where you'll hear certain true good things about the right, and certain true bad things about the left. That is undeniable. No other major source will tell you certain positive things about the right and certain negative issues about the left.
And you DO want an accurate picture, correct?
Then include Fox News in your news diet.
One last thing, try watching them without the preconceived mindset that EVERYTHING they say is false.
Hannity is a lot like MSNBC in his over-partisan attitude, but the rest of Fox is just fine. In fact, it's actually entertaining with enlightening.