If you don't want to read opinion posts written by people who are partial towards one platform or another, you're going to cut yourself off from an awful lot of potentially interesting writing. (E.g. Jeff Atwood & Ed Bott, John Gruber & MG Siegler, Jon Corbet & Bruce Byfield, to pick two fans each respectively of Microsoft, Apple, and Linux).

(Of course, the worst thing is to only read blogs from people whose biases you share, under the delusion that they're the only objective ones...)