Remember that students who feel negatively towards GL may need explanations and help understanding the process.
Students may be afraid of getting punished with lower grades because of mistakes made by other team members. People who learn quickly may feel they're tutoring those who learn slower. And the ones who learn slower may be afraid of feeling pressured to work faster by other team members. The "lazy" team members who don't contribute to the teamwork and only ask for the answers to questions commonly inspire negative feelings. Teachers should use enough time in class to eliminate complaints about problems that arouse outside of it.
Train the students in the skills you want them to develop. Guidance could be given during office hours or during class. Be prepared to make time to help students develop their GL skills..