I've just completed my 300th wiining game in the last few days against AI3 and the card wins is at 87 (Plausibly 2-3 off cause of sideboarding/upgrading).
From what others have said, they have been doing ok so it seems that I and those not getting cards were just at the bootom of the luck curve. Try refreshing the cache and or mixing up the opponents, maybe you just needed a change. Mine helped me.
PS. No plausible evidence to show that the spin machine is bugged since 1.21 release but keep your eye on it just in case.