Raiden's GCCD -> Drop Kick almost sounds like a glitch. Can any other character follow-up a GCCD?
If it is intentional, and remains in any future versions of the game, it pretty much solidifies Raiden's spot in the god tier.
K' is still more of a pain to deal with. Raiden can obviously do a lot of damage, but it's still one technique with a couple of starters. If you know what to look for then you'll be ok. Throw him a lot, do unblockables, rush him down for the first 12-16 secs then just bait his kicks, eventually they get impatient coz you're ahead in life and they'll release the kicks somehow. Don't get me wrong, he's still strong, but K', Kyo, Kula are overall more of a pain to play against IMO.
The last big batch of KCE vids supposedly shows a lot of anti-Raiden tricks but I have yet to watch them yet.