I've learned a rule through experience, "If I find myself
  excessively agreeing with a position, be harsh and discover
  everything that's wrong with it. Continue until you can entirely
  understand and agree with the opponents positions without
  saying, "Yeah, but..".

  Once you can agree dispassionately with the oppositions, and
  even argue their points against the position you favor with
  equal fervor, then you can sort out the goods/bads of each with
  less bias]

  So that's my rule of thumb. I don't know what it's called but
  it's very helpful. [I had a Malcolm Gladwell infatuation a few
  years ago - some critical analysis later though and I got a
  strong reminder of the nature of popular media, how it can carry
  one along and get you to forget certain things you used to
  know... I was sad but it was a necessary cut].