Although I was for a few years, a fan of DBZ, when I was younger, I can't really say I enjoy the show that much anymore, but I still love the game. You definately DON'T need to be a fan of the show to enjoy this game. I'm getting the game for it's multiplayer, which is so much fun, even if you hate DBZ. If you're into fighters, this is awesome. It's no replacement for SSB, but hey, it's still good fun.
For those curious, Yes, the Australian version will work on the UK consoles. Since both Australia and Europe use the same PAL system. It works both ways, which is cool, because that means both UK and Aussie Wii owners can import from the respective other country.