During a filler (not canon, I know), there was some episodes about a former student of Kurenai that had really powerful Genjutsu. In it, Shino mentions that Genjutsu does not work on Insects since insects' simpler nervous systems are harder to manipulate.
During the Chunin exams, Shino was able to easily break off Kabuto's Genjutsu or it just did not work on him at all. The insects inside an Aburame could work just like a tail beast does, helping the user dispel the Genjutsu. Of course, OP Genjutsu like Infinite Tsukuyomi is too much.
Anyway, I thought I would say something about Konoha's most underrated clan.