It's all very peculiar that there are a big group of people who can play the game without any problems on any device, and there's another group of people who have error after error after error...
I agree that people are shouting that the game is fucked and that Telltale should fix it, but how do they explain the fact that there are people downloading, running and finishing it smoothly?
I am between the two groups because I shouted just as hard in the beginning of the release; I've had multiple errors as well, but now nothing, everything runs perfectly (OS X 10.7.5).
Getting a refund though is just a pipe-dream. It may seem like it's the only way to go, and believe me, I wanted one too, but when there are even a couple of people who can play and enjoy the game, TTG will have the higher ground here and no one will be able to force them to give refunds.
This does NOT however make up for the radio silence from Telltale support. A simple "we know there are people with problems" e-mail will just not do. There are a couple of moderators here who at least TRY to help, but I just don't understand why nobody from development team of Telltale Games is offering any support. They're busy, I'm sure, and Fable is probably going to be awesome, but without people buying the products, this won't matter. Any company or any product needs fans to survive.