I must have gotten lucky because my only Blizzard disc (151 Destroyer) flies EXACTLY like I thought it would. A little crazy with the accuracy, but I'll take it.
As far as consistency, the most consistent discs I've ever bought have been eagles and teebirds. I've had all varieties of wraiths, although now I'm thinking because my sample size of wraiths is the largest.
If I don't like something, I just sell it back to a local store I bought it from. I see it in the same way pro tennis players choose tennis balls before they serve.
It's not whether you've won or lost, it's how many beers you were driven to drink after you're done.