There have been a long periods within the Wii's lifecycle that Nintendo hasn't really given us much to talk about; if RFN restricted themselves to Nintendo-related games all of the time, the conversation would have been pretty dull over the last few years. Nintendo tends to stay fairly secretive about game information and then let the floodgates loose in short bursts. Remember 2008 post-Brawl?
Besides, I think there are a number of games on other consoles that are just worth mentioning because of good gameplay design or features elements that are not typically found on Wii or DS offerings.