Its not always as easy as you think to test updates in every situation. Maybe the sandbox wasn't exactly the same code as the live version one wrong line of code is all it takes to cause big problems (like after the rest update). Any amount of testing would not bring up those errors. In terms of bugs in the last update they were hardly anything that major, nothing really game breaking in my opinion (sure it may have taken a few attempts to get in, its not like it would not work). When people expect weekly updates there is always going to be bugs, like always, end of story. But wouldn't that also give them an advantage over other players when its released, they are normal players after all too.