This is a great experience for me. I was introduced to WH via the mobile game Tacticus, which I still play and enjoy.
Mechanicus has been an outstaning compliment to the lore and has also provided world expanding detail on the Adeptus.
If you have enjoyed X-Com, SC or WH table top - PLEASE give this one a try, Great exucution and storytelling.
If you try Tacticus (you should) please consider using my refer a friend code : RID -22-ICE
Sound, music and the overall feel just grabs you. The intro was masterful and I love how the characters can argue amongst themselves. Not hard to learn, but save often. Not overly complex or graphically amazing but very well thought out. Am impressed, which is not easy.
Let's be real: like all TBS games, comparisons with XCOM 2 are inevitable. Does Mechanicus live up to the golden standard? Well...mostly.
The good: peak 40K atmosphere. The members of the Adeptus Mechanicus are callous monsters with zero regards to life. Fittingly, the aliens tend to be more humane than the humans. Also, flamers are devastating. Don't sleep on them!
The meh: melee combat...exists. It is not particularly well developed, and I found it quite forgettable, when compared to the possibilities of ranged combat. Also, cover doesn't exist, and all weapons are always a guaranteed hit. XCOM 2 wouldn't be nowhere as memorable, without its 95% chance to hit (miss!).
The bad: everything revolves around cognition points. If you have them, then you can breeze through the battles with your strongest attacks. If you don't, then you won't be able to use even some basic attacks!
And then there are shields: for some reason, most enemies have shields to absorb part of the enery/physical damage inflicted to them. The issue? Shields are not consistent among enemy types, so what works for one might not work for another enemy of the same class.
Overall, I'd say that Mechanicus is a good game that could have aspired to be much more, were it not for some baffling gameplay decisions.