I haven't seen too many unbiased Mac sites although some are less biased than others. I've seen several unbiased individual reviews, but they often get posted on somewhat biased web sites, so you have to sift through the junk to get the good articles.
The other thing I've noticed is that you don't have as many of the average posters in the forums who actually know a huge amount about the hardware specifics. OTOH, on a % basis, it seems that more of the software developers are on the Mac forums than on the PC forums. ie. On AT, many average posters build their own machines but it seems that vast majority of AT forum members are just these build-your-own-machine types, with some store owners and OEM tech guys and network administrators though. (Oversimplifying here.) On MacNN, most of the average posters have never built their own machine and some haven't even cracked a case, but there are a lot of the actual software programmers posting regularly.
The nice thing though is that with the proliferation of OS X machines, a lot of Mac Unix gurus are coming out of the woodwork. I hope to learn more about Unix now that I have a Mac. It wasn't really feasible on my Windoze PCs to have any form of *nix installed. (I had Linux for a while, but it was just about as un-userfriendly as you can get for a modern OS. No flames please.)