Incidentally, Luigi has guaranteed aerial shoryuken on the entire cast in Smash 4, but it's a percent-specific range [I believe it starts at 107%], at least according to one Luigi main on Smashboards.
Guaranteed stuff is bad? Oh c'mon, if you get hit by the setup move your opponent earned it. You might feel it's "cheap" or whatever but it's part of the game. Luigi dthrow down+b might piss you off, but he has pathetic airspeed, exploitable recovery, ridiculously low traction [I'm not sure he can actually punish long-range Pikachu fsmash on shield... I haven't seen any do it to me], and while he has a projectile, it's slow, telegraphed, and has enough endlag to exploit if he's read. And Luigi's down+B setup shouldn't even KO until over 110% [way higher if he's not operating on rage - I've survived it at 130% as Pikachu thanks to frantically tapping down then holding sideways for the final hit].
Would you just opt to remove kill throws entirely? That is, would you rather everyone "earn it" through some means other than a grab, whether the throw or the followup from the throw kills them?
Also Link Minus bombs must really piss you off [those things just KO at like 110%... I think they should KO at least 20% later personally, and 40% later would strike me as a lot more fair].
Kirby's dthrow into aerials is inescapable [except maybe at obscenely high percents], but you have to do fair or bair based on which way they DI [easy to do on reaction though]. Raptor Boost -> uair at zero percent is also completely unescapable [and he can knee most of the cast after raptor boost at zero, although he has to use his double jump versus most of the cast so he's not usually able to follow up].
I believe a perfectly executed dthrow uair as Falcon is guaranteed on everyone, but I can't say for certain [I know it's tricky for me to dthrow knee a Peach or Yoshi mashing nair, if I can hit it at all]. I'm unsure if Falcon uthrow actually combos or just pretend combos [it's another thing like Fox uthrow that feels like it doesn't function properly at all], but it might true combo with uair as well.
Falco's gatling combo is guaranteed as well, but I really don't think that's what Valravn is looking for.