Having suffered watching many a homer biased MLS commentator - no thanks. SJE, LAG, Houston, Seattle, NYC & NER - all biased & not very good. BTW, most people in the US thinks TSN commentators are biased towards the Canadian teams.
There is a role for biased with a bite against your home team if they are crap - that's the Loons, Orlando, CBus, Atlanta, NYRB & Colorado.