What I just had to learn again, if you are the one who brings in (quality) standards in group tasks (like everybody does his stuff until day x, specify image sources, not only Wikipedia Copy & Paste), you are with a 95% probability also the one who more or less works alone on it at the end.
(Works the same with group coding projects where the one person in your group that's able to code relies on you doing most of the work because that person is lazy playing games)