Hands down best 40k author, however a lot of that is coming from him somewhat downplaying the grotesque over the top grimdarkness of entire setting and just writting it more like either traditional war story (Gaunt) or occult mystery (Eisenhorn) with plenty of horrors present but more related to the genre than to setting. Sadly i didn’t read Ravenor trilogy or Bequin novels, can’t get them in Poland.

Also 40k recently got some interesting authors rising. David Annadale or Robert Rath are getting some quality stuff out, not like the Goto shit.