I think WW is a great way of putting the Canada/US food guides into play. Whether you do WW or count calories the big thing is to think about how much of each food type you should be eating. Check the food guides. They are quite good - I think they have too many carbs, but that's just me.
My thinking is:
Lots of veggies, dairy & protien.
A bit less fruit & breads.
Lots less fat - but you still need some.