Hahaha, I have some films in my possession that critics believe it's "bad".
I saw Toy Story 3 various times (DVD and through Starz HD), and I can tell you that it's a lot better than TS and TS2 in terms of the plot (though I still like TS/2). Check it out one day, you won't regret it.
One tip: if you don't mind ads, logos, marginalized credits, and voiceovers on Starz (yes, this is not a lie), you can watch it there, including "Up". Otherwise, DVD or online searching are your alternatives.