Well, if u refer back to Sasuke's fight with Danzo, Sasuke is adept at picking up the habits of his opponents. He used genjutsu in that instance in order to slightly alter Danzo's perception of time. That is the kind of thing I am saying Sasuke will be able to pull off. Genjutsu that will trick and distract his opponent in order to create openings. Sasuke also did that kind of thing against Deidara.
Sasuke's skill with genjutsu probably still isn't as good as Itachi, but with a rinnengan and the yin seal Sasuke's genjutsu should be a lot stronger