Imperator: Watched a few vids, didn't interest me. I really can't see the point of a game with an empire-building level of scale using real-time mechanics. I mean, it lasts potentially hundreds of in-game years, you really shouldn't need to be micro-managing everything on such a tight time limit.
Mechanicus: Played it, it's quite good, but the combat doesn't really have much tactics involved. There's no cover mechanic - if you can see them and they are in range, then you hit 100%. A lot of people have complained that it's too easy, although if that's truly the case then RNGeezus must have really shat all over me when I played because I got royally hosed on every mission.