Oof. Mechanicus starts out ok, even has some cool mechanics but then gets utterly trivial and just keeps going like that.

Are you playing modded Xcom? I enjoyed a run with amalgamation classes, gem-based psi and lots of mods to make the enemies harder but it has been shelved for a while because the Humanity's requiem Mutons are too much to take on and I need to think about how much to sacrifice to pass missions until my weapon upgrade finishes.