They know exactly that. Luckily, it's a server driven service, so over time everything can magically get better. They are going to aggressively harvest user data throughout the getting better process. Their options were: launch bad and get better as fast as possible (using millions of devices for feedback) or spend a few years doing things by hand then still releasing something subpar. Rip the bandaid off now.
In every other case HN screams "more data > clever algorithms!" -- this is their way of more data. It'll be painful at first, but it will get better quickly. It has only been a week since public public release. It has been sucking in betas for months too. None of this is new, exciting, or newsworthy. Release your burdens and get back to work.