I personally like to play very defensive against Raiden. It's the only way to me that works. Keep Ice Clone up always. Stay in front of clone, if Raiden is distant, shoot some Ice Balls away hoping for a Super-Man or His "projectile". After poping Ice Clone if he is near you can use D4 (good range and recovery) and 2,2 to make pressure.
I also like to pop a Ice Clone after I kombo him down, some Raiden opponents really luuuuuuuve to wakeup with Super-Man, so they get owned this way until they respect your gameplay style. But keep in mind that EX Super-Man has shield, so it will eat the clone and you as well in the process, lol.
Ice Clone is the number 1 skill to be successful against Raiden, make no mistake about it.