When an exam is outside the syllabus anyone would complain as it is not standard, students don't get the chance to revise as they should before any exams. DGCA as an examining authority is suppose to set the standard and know the difference. Some friends who took the composite complained quite a lot and had said that they could answer many of the technical questions but can't be sure as they didn't revise so it was not a sure pass for them (all 3 passed). I guess that's what nikaviator meant by 'it was hard to tell'.
Look at it this way if only a handful of heli guys complained maybe it wouldn't have been that effective and no corrective measures would have been taken, so it was for the best of everybody in this case and for the future that the complaints were filed!