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].