No. Blizzard is one of the most experienced company in this field. Or, well, it should be. They do know that a tremendous amount of people will log on, they have to prepare for it. Besides, the major update was made one week ago, here it just consists in making the card available for crafting and releasing a new type of booster. I'm certainly not aknowledgable when it comes to servers and so on, but I do not see in what way such a small update can provoke a mess like this.
Also, Blizzard is doing it EVERY SINGE UPDATE. This is completely unprofessional. It's not being an impatient child to say that this company is not doing its job correctly, it is the truth. I do not care whether I have to wait some more days to get my hands on the new shiny cards, it is simply that the way Blizzard is postponing over and over again the update for EU, and also how unable they have been to handle the problem on NA server is everything but a demonstration of skill and profesionalism.