MY roommate in college from from Australia, we used to offer this stuff to people on our floor just to get a kick out of the reactions. I dont remember ever personally meeting someone that actually liked it.
My British roommate used to have some every morning on his toast, but the appeal of Marmite eluded me until I tried it on a grilled bacon sandwich. The salty yeastiness of the Marmite goes well with the smoky umami of the bacon. But that's all it's good for, I'm sure. ;)
The Star Market at Packard's Corner has a decent English foods section, although I don't recall if it's Vegemite or Marmite that they have. It may be Marmite. I assume it's a Coke Vs. Pepsi thing, people prefer one or the other?