I recently read a headline asking, "Is Piers Morgan Marmite?" I suppose this is a British idiom; what does it mean?

Marmite is a yeast based spread that (so it is claimed)everybody either loves or hates with no middle ground possible. It’s often used as a metaphor for anything that creates strong but opposite reactions in people.

You Brits have interesting sayings. We don't have anything like that, do we, Geoff?