Use the time wisely. Some discussion of other topics may break the ice within the group, but remember that you have a specific task to accomplish. Use the time to outline or cluster ideas, to clarify concepts, and to plan for how a product will culminate. If you do not understand what another person has said, ask for clarification. Alienating others in the group or intimidating them does not make for a good group interaction.
Cooperative projects mean that everyone contributes and feels good about the final product.
Regardless of the quality of such a project, I view it as unsuccessful because of the lack of learning cooperation. If a pathological problem occurs in a group, instructor intervention early may be required. Respect the contributions of others if you want your own contributions to be respected. One of the functions of small group work is to give students a chance to see things from different perspectives. Remember, listening is an art form to be cultivated.