I don’t think there’s a specific bias against Microsoft.
Steve Jobs once said, "I think PCs are going to be like trucks." However, a lot of people buy trucks! The top two vehicles sold last year were trucks. I think a lot of Microsoft users are power users, and use their equipment for heavy lifting that falls outside of ‘common uses’ that Verge editors write for. I need Excel. I can’t use Google Docs or Excel for Mac (half-ass job by MS) because they are inferior ways to do serious spreadsheet analysis.
In reviews, Josh et. al simply look at the most common use cases (browsing the web, email, writing) because that’s what everyone can relate to during a review. Josh’s biggest gripe against iPhone is their lack of a kick ass GMail app. Why? Because so many people use GMail. The fact that I can’t easily modify Excel Docs on my non-Microsoft phone isn’t a common use case, so it doesn’t factor in his review. He’s not writing his review for you. He’s writing for you mom, your aunt, your cousin who just want to have a simple, easy way to get the basics.
However, the writing is excellent and the site is light years ahead of the web. Everyone is biased to what they know. Read Tom Warren’s stuff. Or Chris Ziegler. There’s something for everyone here.
