I think it's pretty obvious why ssn will lead on united, liverpool, chelsea over other clubs - it's because the majority of their viewers support those clubs. I agree that they talk utter shit but it's only utter shit because it's biased towards those clubs. If you know most of your audience (gloryhunting armchair fans if you prefer) are supporters of those clubs then they are going to put a positive slant on the stories to do with those clubs.
But I don't really give a shit to be honest - it's 2009 and the vast amount of media sources means you can get your information from an almost limitless amount of places. I do find it surprising why we're getting so worked up about criticism - take the higher ground because if your team is doing well on the pitch/signing the best players then you don't even need to gloat - your team does it for you!!!