i haven't seen wall-e, cars, and up yet. and i can't remember if i've seen toy story 2. :P
but i basically love everything i've seen so far. it's great how they make movies targeted to both young and old audiences. there's something for everybody.
my favorites would be..... this is hard...... errrr.... the incredibles, finding nemo, and monsters inc because boo is so cute and i mike wazowsky (??) is so funny. XD