The problem is that games as they are usually developed require a lot of investment before the systems in them are supposed to gel together and become a playabl

The problem is that games as they are usually developed require a lot of investment before the systems in them are supposed to gel together and become a playable product. If it becomes clear that it's kind of crappy at that point, there's a huge incentive to just finish it up as best as they can and throw it out on the market to recoup a bit of the costs.