There have been a few nice pieces written taking a look at Ritual Three: Vile Decay since it came out last month:
GeekRex gives Vile Decay an "A", saying it is conceptually challenging and a visual treat.
Zainab Akhtar at Comics & Cola calls Vile Decay compellingly beautiful.
Rich Barrett at mental_floss names it one of the most interesting comics of the week.
Rob McMonigal at Panel Patter writes a really thoughtful and kind piece.
And finally Frank Santoro at The Comics Journal breaks down the book, saying it's "Impressive stuff. Check it out." Be warned, his review contains spoilers.