Student evaluations are much worse than when I was lecturing all the time. Students complain that I'm not teaching them, that I never tell them the answers, that I expect them to learn everything on their own. Students misunderstand the process and its objectives and benefits. I usually get good evaluations, and that has not changed. The only difference since I have started to use group learning is that students tend to say that the group stuff has been enjoyable and has helped them to understand the material.
Students seem to be liking the approach.