Spoilers for others, but:
The ending itself was happy regardless, but your actions regarding Animatronic Goofy, Donald and Daisy, as well as Horace, Pete and all the bosses, were reflected in the ending.
So yes, the ultimate ending is always positive, but if you used thinner on all the boss fights, didn't put the robots together, didn't help Horace and didn't really help Pete, that would be reflected in the ending with alternate scenes. So technically there is a Hero and Jerk ending in the sense that, sure, you saved Wasteland and are friends with Oswald now, but you destroyed a bunch of stuff (like Small World's clock or the Captain Hook robot), nobody cares about Horace, you didn't help your/Oswald's friends and I forget what happens to Pete.
It's not exactly the best use of the system, but it was still cool.