I can't stand doing group projects, even if it is just me and a partner. The in class group projects don't bother me as much, it's the out of class projects that require Powerpoint presentations. In my opinion the cons outweigh the pros. Teachers always seem to think that if they require the students to do group projects then the students will gain communication skills, networking skills, and teamwork skills. That NEVER happens!
There is always that one kid that does absolutely nothing, one person gets stuck doing all of the work, some kids don't care about their grade as much as the others, some people work better individually, and it is hard to meet up in one place at a certain time because of conflicting schedules. Also everyone gets the same grade so if there is a group of 5 and 2 of the members did the whole thing then it isn't fair and there is usually no way to tell who contributed to the project.