To be honest Im reluctant to criticise Tatum as a commentator, as I've done commentary myself and it's not as easy as it looks. Its more the fact that he describes every televised meeting as "fabulous" when more than once it's been distinctly average.
A few years ago, I remember watching the ashes on BT. During the tea break in one of the tests, the pundits had a good 15-20 minute debate about where they thought test cricket was and how things could be improved, how it could be marketed better and how they can make it more attractive to younger fans. You never see this type of discussion happening during speedway coverage and it frustrates me that all seem afraid of saying anything that doesn't "toe the line".