Agreed with Degrees. Normal sharingan doesn't have that much of a boost. An addition to speed, sure, but nothing more beyond that besides a FEW genjutsu moves and a back up against genjutsu, which barely anyone but Uchiha use, save Kurenai and maybe some other small ninja that I can't even remember right now lol. Everything else really depends on the users skill, on how well they can use the sharingan, which doesn't make it overpowered. For example, the sharingan may seem overpowered in Itachi's hands considering he could pwn people with three tomoe, but that's only be he was such a skilled ninja. On a scale from one to ten, I rate the normal sharingan at... maybe 6 or 7 at most.
But the MS and EMS... O_O" We already know that the MS is ridiculously strong, and we haven't even seen a portion of what the EMS can do. :| The only thing that we've seen of the EMS from Madara is the teleportation thing, but nothing really big yet, considering that it apparently has like three added super-powerful moves. On a scale from one to ten, the MS and EMS are off the charts lol.