"In learning contexts, students do report experiencing a range of emotions, and frustration is one of the negative emotions they deal with (Do & Schallert, 2004; Pekrun, Goetz, Titz, & Perry, 2002). Despite the advantages reported in literature about collaborative learning methodologies in terms of social and psychological benefits (Panitz, 2001; Roberts, 2005), students engaged in collaborative learning activities can feel a high level of frustration."
I like the idea of learning how to work in a collaborative way, but not also while your own grades are dependent on it. You can't control how much others put into a project, yet you get graded for the group effort. Not the way to go.