The Toronto Eaton Centre is Toronto's largest mall - so its going to be busy with lots of people (interesting, goodlooking, weirdos, etc).
Some shops in the Toronto Eaton Centre can be found in other malls but they have some unique stores that are not in the rest of the GTA.
Prices are on par with other malls/stores outside of the Eaton Centre.
There is a lot of food options with 2 food courts i think, and a couple of restaurants (baton rouge). Overall I think the Toronto Eaton Centre is for mall lovers, if you love big crowds, this is your place.
Things I don't like - the washrooms are nothing special, and there isn't enough table and chairs in the food courts during peak hours (lunch, evening).
Personally - I wouldn't travel all the way from Brampton or any other city to go to the Toronto Eaton Centre - but thats because I'm not a mall rat!