If you can only play it on the Wii then go ahead and play it, you'll love it.
All the great things are here, you have a nice selection of weapons to choose from you'll want to try them all out at least once. And see how much fun you will be able to have with each one, you got things like skateboards, knifes, bikes, bowling balls, basically anything you can think of. That's just plain fun once you set down and think of it, attacking and killing zombie is so much fun even if you only have a gun.
Other things that are good are it's got a good story to it, but at the same time it's really short so that's a down side to it. But isn't a huge problem either, you will also see survivors in the mall and you'll have to rescue them. Most of the time is fun helping them but it can get a little boring at times to, but mostly you'll enjoy it.
The graphics are ok they could be better for the Wii than they are, they aren't the worst you will see though but graphics have never been a big deal to me. But on the flip side there is a lot of gore which every zombie killer loves to see, and I don't think no one will disagree with me on that.
As far as the zombies they sometimes appear out of nowhere which got on my nerves a little bit sometimes but I got used to seeing it. Sometimes they wouldn't even attack me I would just stand right beside it, it didn't happen but maybe three times through out the whole game.
Overall Chop Till You Drop is great for the Wii a fantastic game, and you should really get it if you haven't got it or played it on the Xbox 360. Since I've played it before I think it's more fun on 360 and that made me not have a much fun playing it on the Wii.