For the most part, it seems to be a lot better to me. For a long time I was getting a lot of error messages in the Merchant, and it was impossible to get it to display packs. Now packs do show up, but I still get error messages on occasion for other stuff, particularly when selling cards back. After the 2nd or 3rd page, it will suddenly say, "unable to contact server" (or something like that), and then won't work anymore.
But game-wise, it does seem more stable to me.