If you're a fan of the team you're commentating on then you're 50% done...and honestly if you're a fan of a diddy club you're probably more in touch with the current affairs of your opponents than any of the BBC/Sky/BT "pundits"
Very difficult to commentate on a game watching it on the TV though, the camera doesn't follow the game the same way you would from a static vantage point...maybe it's easier on Football Manager or something, I haven't played it since it was on the original Xbox, so what maybe 2001?