The best people to use the Sharingan against are...
People which i'm not sure about are...
Sakura (I don't know if you can use her "The Great Sakura" jutsu against her)
People who aren't very good to use the Sharingan Against are...
Neji (You can't use his Palm Rotation)
Shikamaru (You can't use either of his Jutsu)
People who are useless to use the Sharingan against are....
Gaara (You can't do anything, you can't even attack when copying Gaara! The good thing is though, it wears off in 5-10 seconds...)
Hope this helps
Added by: king_jamie56 Feb 26th 2007, ID#25735