Cycle World seems to be a fairly balanced mag at first, covers sportbikes, cruisers, everything in between. But read more than a couple pages and it's very biased toward HD, and they're not particularly discreet about it. Every "new" HD model wins their head-to-head tests, and even when the HD is the slowest, crappiest bike, they still declare it the winner based on "overall feel" or "cool factor" or some other bullshit.
I don't get a mag, I just get an email newsletter from motorcycleusa.com, that has new model reviews and big MC news. Their reviews seem to be pretty fair towards all brands. Typically whenever I order something from motorcyclesuperstore, an issue of Motorcycle USA comes with it, which is a decent read.