They are powerful, yes. But they are easy to play around. None of them have immediate board impact (nor do any dying wish minions, thankfully). Rot9M is extremely susceptible to RNG for how useful it is. Klaxon and Vorpal Reaver are really only good for their wraithling/creep synergies since removal is so common in Duelyst. If they stay on the board for more than a turn, then yes, they’re game winning material.
I’m mostly saying it’s a good thing we don’t have powerful dying wish minions that can protect themselves or have rush. I never ever want to see a dying wish minion with rush.
In other news, I think Nekomata helps enable Lurking Fear as a card. I’ve never liked Lurking Fear because of what it does to your card advantage, but if you can generate a lot more draw with Nekomata, it will actually be useful!
Edit: I just remembered Grimes has immediate board impact, but thankfully he’s pretty pricey and is weak to fickle RNG.

