Players are most likely to evaluate a game within the first hour of gameplay. Delivering an end product with bugs will lead to criticism from your end users, since it ruins their experience which in turn can lead to a significant reduction in unit sales.
If your users are unhappy with the features, they are likely to delete it. Once deleted, there are very few chances for them to download a newer version the next time it releases. The first impression is the one and only hope you have in this case.
Gaming is all about player experience. With good user experience, your game will thrive.