I haven't, but I was interested in it, since despite my love for Warhammer 40k as a setting, there are few ways in which I can actually engage with it and have fun.
Welp, now I know that I should set my expectations even lower than I had already. Since W40k: Gladius (land-based 4X with Space Marines, Imperial Guard, Orks and Necrons) turned out to be (reportedly) fantastic, I was hoping Inquisitor Martyr would be good too, especially with the amount of coverage GeeDubs had on their community blog.
I can't wait to hear from other people what went wrong. If John "TotalBiscuit" Bain was still alive, we would probably have a nice and informative First Impressions video, but alas.