Not sure why some are surprised by this, things like this happen time to time with patches, no matter the game. I dont know if it is because it is D3 and Blizzard, so they are held to a higher level of standard that other games get away with, but this isnt the first or last time something like this will happen. Even D2 had several game breaking bugs that needed emergency patches. I can remember one patch that caused high level runes to drop at a much higher rate than usual, that forced them push out a patch quickly to address the issues. Anytime they release a sizable patch, expect them to release another patch soon after.
MMO's are known for needing emergency patches due to gold/gear dropping at higher rates, gold duping, rare mobs spawning constantly with their best items dropping every time, great items dropping off trash mobs, the list is a mile long for screw ups.
EQ was a big culprit for releasing a patch with many game breaking issues that forced them to bring the server down for an emergency patch. Some patch nights the game would go out every other hour because people would find bug after bug. The best thing about the emergency patches was rare spawns would spawn again after you just killed them, you could kill the spawns multiple times in one day without having to wait a week. Now bugs that hurt the player took a week to fix, but any bug that benefited the player was fixed within hours and some of the nastiest bugs brought the game down within minutes of discovery. That is why many guilds/raiders and players would play all day on patch day due to finding bugs like this.
I understand why many people are upset with D3 after the horrible launch, but with the patches and changes over the past year, D3 has turned into a good game that is very fun to play imo. I have played countless hours with D3 after they address many of the serious issues. Since the bad launch and Jay Wilson leaving for another position in the company, the game has rebounded quickly after many much needed changes/updates imo. The game doesnt have the same fan base as it did during the first month, but there is still a healthy community.
Hopefully some of the upset fan base will give the game another chance especially when the expansion comes out. If they continue to fix and address the player issues, I expect the game to be close to D2 LoD with re-playability that keeps people hooked for years. I guess I feel a little different because I avoided the game the first two weeks due to server problems, but subtracting the cost of the CE, I have made a little over a thousand dollars selling items I couldnt use for my class/build. It is much tougher to sell things now for me, but even still it is nice when you can make over 100 from a rare drop. D3 still has its problem, but for me I havent played another recent game in the genre that is as much fun as D3, outside of D2. I have played hundreds of hours in D2, and I expect D3 will end up with similar play time. I dont care for PVP, so Im not really letdown by the lack of PVP and the arena they promised.