I have no problem with accelerant based creatures, but it's the same problem I had with the practical Fifield in Prometheus. I want more Alien in the mutations. The Neomorphs nailed that, as did some of the random creatures from Fire and Stone. I'm not so sold on these ones. They look too heavily like the Leon we've already got.
But I'm happy for more variety of enemy. Hopefully means we're going to see some new campaign content soon. Or a new Horde mode with the pathogen enemies.