-Madara had to hold him down with susanno to get a raikage, that was distracted by tsunade's recklessness.- I meant there's nothing indicating finger genjutsu is weak, even if you think normal sharingan genjutsu is weak. Madara was able to incapacitate Raikage with sharingan genjutsu.
- Let me make sure I got this right, your implying that if any number of people see a genjutsu medium they are put in a genjutsu? What about sound based genjutsu, if anybody hears the genjutsu they are all in it? I would appreciate it if you did explain to me how it works. I still think your wrong about that, though.
- If Itachi's MS jutsu cost 30% of his chakra, how do you explain Itachi using 5 MS jutsu during the Sasuke fight plus 3 Karasu bunshins, 2 Gokakyu and genjutsu: sharingan?
-that's how most genjutsu mediums work. The caster creates a medium that the victim has to fall for. whether that be eye contact, hearing a specific melody, looking at a specific object, being within a certain range. etc etc etc.
-he went past his limit, and died. Pretty simple explanation.