MCom from IGNOU is very easy as it can be accomplished with minimum efforts. The exams include the entire course either in short notes, long answers, differences, etc. However, the assignments are not that easy. They require a thorough understanding of each topic, and a lot of written work. All in all the level of difficulty of exams is average but the quality of education is not hampered by this.
M.Com from IGNOU is not very difficult and can be actually passed with minimal effort. If you go through the previous year's paper, you will find that the exams are fairly lengthy. Almost the entire course is included in the exams either in the form of short notes, long answers or differences. So you will have to learn a lot. But the level of difficulty is not that high. However, the assignments are not that easy. They require a thorough understanding of each topic and a lot of written work.
The salient feature of IGNOU is to specifically cater to the needs of people who cannot pursue full-time education. Considering this the exams are not very challenging that will become a burden for part-timers.