Madara capture the Kyuubi with a 3 tomoe Sharingan. The same the man who attacked Konoha ( Who most likely is Tobi ). This alone proves Madara has powerful Genjutsu.his genjutsu is weaker than sasuke and itachi he hasit even showed genjutsu beside on kurama
And dude, just because he hasnt shown any other Genjutsu doesn't mean he has weak Genjutsu. Thats fail logic.