There are other rushdown chars in the game m8, but none of them do what Raiden can do. Thats my issue. You have a character who can take you in the corner with one move if he touches you and once there, your options are zero to none if the Raiden player knows what he is doing.
dvorah literally does that. no one is doing it yet, but she can. costs 1 meter to get them into the corner, but it goes into a pure 50/50 directly (unlike raiden not getting a 50/50 off superman), or 45ish damage instead. she also 50/50s on BLOCK off of one of her mid strings if she has full stamina and good execution anywhere on screen.
scorpion doesn't need to carry you to the corner. all his vortex stuff works midscreen. now, his overhead is much slower than raidens, but it can come at different times in the combo.
quan chi is +14 on every mixup he does if he spends a bar, and some form of + if he covers it with bat. he also doesn't need the corner, since trance restand mixup can work anywhere on stage. also it can be timed to be a very hard to block overhead to low or low to overhead.
since his overhead is 15 frames, technically the only 50/50 is the first one out of trance. everything after blocked meterburn ground pound or bat is not a 50/50 because of this, but it's pretty hard to get out of still.
raiden only true 50/50s off of his restand that sacrifices damage. if he supermans you from anywhere not in the half of the screen closest to the corner, he leaves you at full screen where he gets little to no pressure. even if he supermans you into the corner, he doesn't true 50/50 you.
if you call out him doing f12 f12, you can press a button and take advantage. if he calls you out pressing a button after f12 and does f12b2, he is going to do at max like 20 damage because of the scaling on lightning strings. (or he'll do like 15 into a true 50/50, which is probably the best idea there).
if you call him out on wanting to hit you on the f12b2hold on block, then he is -8. there are ways to counter poke while being safe to both EX Shocker because it is slow and EX Vicinity Blast because it is a high. he has to do the really unsafe EX db3 or EX superman to beat d4 after f12b2hold.
oh and EX shocker is punishable on block but i didn't see a full punish on it once lol
some characters can even punish f12b2hold when cornered because of the reduced relative pushback, like how Alucard punished with d4 (but he didn't do anything off of it, like cancel it into an overhead/low/unblockable special as a mixup)
all characters can do a run up after f12b2hold, confirm raiden did not press anything, and then pressure. they have, technically 14 frames before a frame perfect f12 after the -8 move, and 8+reversal startup if raiden does a reversal. if your character has a mixup, that's a decent time to do it. back throw is also good.
eventually raidens will start doing more tricks like f12b2hold lightning backdash cancel (which uses all stamina but resets positioning), f12b2hold cancel into shocker for an additional hit and still being safe, and similar things.
b2 OS is -8 on block because it's non ex shocker. now, raidens will start using different setups to trick you down the line, like b2 OS into Lightning run cancel (which is minus on block) and b2 OS ex vicinity blast (which you will probably block high because b2 is two overheads) but it's 0 on block which is tight. but it costs a meter.
some other things
dizzy did resets into restand lightning ball (db1) which
1) after a long combo, sometimes drop. in which case raiden is punishable
2) is only +9. can't press buttons if he does f12, but CAN press buttons if he does low/overhead mixup, and CAN jump out
if you jump b2 (overhead) and he does the option select correctly or not at all, and the b2 anti air HITS, the second WHIFFS and he has like 80 frames of recovery, where you can tech roll and punish.
in conclusion, it's not all 50/50s if he is forced to superman, it is not all 50/50s if he doesn't do a very specific combo that also reduces his potential damage by 10% per combo, and raiden pressure IS very strong but there are guesses you can make when he does the non 50/50 stuff that can turn momentum around that can cover multiple options.
yes, raiden is a top tier character with strong tools that are unique
but, this thread is not covering a LOT of in depth analysis of his options and risk reward analysis which is a huge part of the game period
this forum in general is full of complaining without being thorough
oh and back dash doesn't work against f12 f12 with most if not all of the cast. backdashes are not great escapes from pressure in general, you do them as a predictive footsie tool to make something whiff in neutral because they are fast but not that invincible.